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Damerau A, Rosenow E, Alkhoury D, Buttgereit F, Gaber T. Fibrotic pathways and fibroblast-like synoviocyte phenotypes in osteoarthritis. Front Immunol 2024; 15:1385006. [PMID: 38895122 PMCID: PMC11183113 DOI: 10.3389/fimmu.2024.1385006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2024] [Accepted: 05/14/2024] [Indexed: 06/21/2024] Open
Abstract
Osteoarthritis (OA) is the most common form of arthritis, characterized by osteophyte formation, cartilage degradation, and structural and cellular alterations of the synovial membrane. Activated fibroblast-like synoviocytes (FLS) of the synovial membrane have been identified as key drivers, secreting humoral mediators that maintain inflammatory processes, proteases that cause cartilage and bone destruction, and factors that drive fibrotic processes. In normal tissue repair, fibrotic processes are terminated after the damage has been repaired. In fibrosis, tissue remodeling and wound healing are exaggerated and prolonged. Various stressors, including aging, joint instability, and inflammation, lead to structural damage of the joint and micro lesions within the synovial tissue. One result is the reduced production of synovial fluid (lubricants), which reduces the lubricity of the cartilage areas, leading to cartilage damage. In the synovial tissue, a wound-healing cascade is initiated by activating macrophages, Th2 cells, and FLS. The latter can be divided into two major populations. The destructive thymocyte differentiation antigen (THY)1─ phenotype is restricted to the synovial lining layer. In contrast, the THY1+ phenotype of the sublining layer is classified as an invasive one with immune effector function driving synovitis. The exact mechanisms involved in the transition of fibroblasts into a myofibroblast-like phenotype that drives fibrosis remain unclear. The review provides an overview of the phenotypes and spatial distribution of FLS in the synovial membrane of OA, describes the mechanisms of fibroblast into myofibroblast activation, and the metabolic alterations of myofibroblast-like cells.
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Affiliation(s)
- Alexandra Damerau
- Department of Rheumatology and Clinical Immunology, Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt Universität zu Berlin, Berlin, Germany
- German Rheumatism Research Center Berlin, a Leibniz Institute, Glucocorticoids - Bioenergetics - 3R Research Lab, Berlin, Germany
| | - Emely Rosenow
- Department of Rheumatology and Clinical Immunology, Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt Universität zu Berlin, Berlin, Germany
| | - Dana Alkhoury
- Department of Rheumatology and Clinical Immunology, Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt Universität zu Berlin, Berlin, Germany
| | - Frank Buttgereit
- Department of Rheumatology and Clinical Immunology, Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt Universität zu Berlin, Berlin, Germany
- German Rheumatism Research Center Berlin, a Leibniz Institute, Glucocorticoids - Bioenergetics - 3R Research Lab, Berlin, Germany
| | - Timo Gaber
- Department of Rheumatology and Clinical Immunology, Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt Universität zu Berlin, Berlin, Germany
- German Rheumatism Research Center Berlin, a Leibniz Institute, Glucocorticoids - Bioenergetics - 3R Research Lab, Berlin, Germany
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2
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Wernlé K, Thiel CS, Ullrich O. Increased H3K9me3 and F-Actin Reorganization in the Rapid Adaptive Response to Hypergravity in Human T Lymphocytes. Int J Mol Sci 2023; 24:17232. [PMID: 38139061 PMCID: PMC10743231 DOI: 10.3390/ijms242417232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 11/27/2023] [Accepted: 12/05/2023] [Indexed: 12/24/2023] Open
Abstract
Our study explored the impact of hypergravity on human T cells, which experience additional acceleration forces beyond Earth's gravity due to various factors, such as pulsatile blood flow, and technology, such as high-performance aircraft flights or spaceflights. We investigated the histone modifications Histone 3 lysine 4 and 9 trimethylation (H3K4me3 and H3K9me3, respectively), as well as the structural and cytoskeletal organization of Jurkat T cells in response to hypergravity. Histone modifications play a crucial role in gene regulation, chromatin organization and DNA repair. In response to hypergravity, we found only minimal changes of H3K4me3 and a rapid increase in H3K9me3, which was sustained for up to 15 min and then returned to control levels after 1 h. Furthermore, rapid changes in F-actin fluorescence were observed within seconds of hypergravity exposure, indicating filament depolymerization and cytoskeletal restructuring, which subsequently recovered after 1 h of hypergravity. Our study demonstrated the rapid, dynamic and adaptive cellular response to hypergravity, particularly in terms of histone modifications and cytoskeletal changes. These responses are likely necessary for maintaining genome stability and structural integrity under hypergravity conditions as they are constantly occurring in the human body during blood cell circulation.
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Affiliation(s)
- Kendra Wernlé
- Institute of Anatomy, Faculty of Medicine, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland;
- Faculty of Medical Sciences, Private University of the Principality of Liechtenstein (UFL), Dorfstrasse 24, 9495 Triesen, Liechtenstein
| | - Cora S. Thiel
- Institute of Anatomy, Faculty of Medicine, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland;
- Institute of Machine Design, Otto-von-Guericke-University Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
- Space Life Sciences Laboratory (SLSL), Kennedy Space Center, 505 Odyssey Way, Exploration Park, Merritt Island, FL 32953, USA
- UZH Space Hub, Air Force Center, Air Base Dübendorf, Überlandstrasse 270, 8600 Dubendorf, Switzerland
| | - Oliver Ullrich
- Institute of Anatomy, Faculty of Medicine, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland;
- Institute of Machine Design, Otto-von-Guericke-University Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
- Space Life Sciences Laboratory (SLSL), Kennedy Space Center, 505 Odyssey Way, Exploration Park, Merritt Island, FL 32953, USA
- UZH Space Hub, Air Force Center, Air Base Dübendorf, Überlandstrasse 270, 8600 Dubendorf, Switzerland
- Department of Industrial Engineering, Ernst-Abbe-Hochschule (EAH) Jena, Carl-Zeiss-Promenade 2, 07745 Jena, Germany
- Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
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3
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Niloy RA, Holcomb MC, Thomas JH, Blawzdziewicz J. The mechanics of cephalic furrow formation in the Drosophila embryo. Biophys J 2023; 122:3843-3859. [PMID: 37571824 PMCID: PMC10560681 DOI: 10.1016/j.bpj.2023.08.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 06/06/2023] [Accepted: 08/07/2023] [Indexed: 08/13/2023] Open
Abstract
Cephalic furrow formation (CFF) is a major morphogenetic movement during gastrulation in Drosophila melanogaster embryos that gives rise to a deep, transitory epithelial invagination. Recent studies have identified the individual cell shape changes that drive the initiation and progression phases of CFF; however, the underlying mechanics are not yet well understood. During the progression phase, the furrow deepens as columnar cells from both the anterior and posterior directions fold inwards rotating by 90°. To analyze the mechanics of this process, we have developed an advanced two-dimensional lateral vertex model that includes multinode representation of cellular membranes and allows us to capture the membrane curvature associated with pressure variation. Our investigations reveal some key potential mechanical features of CFF, as follows. When cells begin to roll over the cephalic furrow cleft, they become wedge shaped as their apical cortices and overlying membranes expand, lateral cortices and overlying membranes release tension, internal pressures drop, and basal cortices and membranes contract. Then, cells reverse this process by shortening apical cortices and membranes, increasing lateral tension, and causing internal pressures to rise. Since the basal membranes expand, the cells recover their rotated columnar shape once in the furrow. Interestingly, our findings indicate that the basal membranes may be passively reactive throughout the progression phase. We also find that the smooth rolling of cells over the cephalic furrow cleft necessitates that internalized cells provide a solid base through high levels of membrane tension and internal pressure, which allows the transmission of tensile force that pulls new cells into the furrow. These results lead us to suggest that CFF helps to establish a baseline tension across the apical surface of the embryo to facilitate cellular coordination of other morphogenetic movements via mechanical stress feedback mechanisms.
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Affiliation(s)
- Redowan A Niloy
- Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas
| | - Michael C Holcomb
- Department of Physics and Geosciences, Angelo State University, San Angelo, Texas
| | - Jeffrey H Thomas
- Department of Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock, Texas
| | - Jerzy Blawzdziewicz
- Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas; Department of Physics and Astronomy, Texas Tech University, Lubbock, Texas.
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4
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Thiagarajan R, Bhat A, Salbreux G, Inamdar MM, Riveline D. Pulsations and flows in tissues as two collective dynamics with simple cellular rules. iScience 2022; 25:105053. [PMID: 36204277 PMCID: PMC9531052 DOI: 10.1016/j.isci.2022.105053] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 06/23/2022] [Accepted: 08/26/2022] [Indexed: 11/29/2022] Open
Abstract
Collective motions of epithelial cells are essential for morphogenesis. Tissues elongate, contract, flow, and oscillate, thus sculpting embryos. These tissue level dynamics are known, but the physical mechanisms at the cellular level are unclear. Here, we demonstrate that a single epithelial monolayer of MDCK cells can exhibit two types of local tissue kinematics, pulsations and long range coherent flows, characterized by using quantitative live imaging. We report that these motions can be controlled with internal and external cues such as specific inhibitors and substrate friction modulation. We demonstrate the associated mechanisms with a unified vertex model. When cell velocity alignment and random diffusion of cell polarization are comparable, a pulsatile flow emerges whereas tissue undergoes long-range flows when velocity alignment dominates which is consistent with cytoskeletal dynamics measurements. We propose that environmental friction, acto-myosin distributions, and cell polarization kinetics are important in regulating dynamics of tissue morphogenesis. Two collective cell motions, pulsations and flows, coexist in MDCK monolayers Each collective movement is identified using divergence and velocity correlations Motion is controlled by the regulation of substrate friction and cytoskeleton A vertex model recapitulates the motion by tuning velocity and polarity alignment
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Affiliation(s)
- Raghavan Thiagarajan
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France
- Laboratory of Cell Physics ISIS/IGBMC, CNRS and Université de Strasbourg, Strasbourg, France
- Centre National de la Recherche Scientifique, UMR7104, Illkirch, France
- Institut National de la Santé et de la Recherche Médicale, U964, Illkirch, France
| | - Alka Bhat
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France
- Laboratory of Cell Physics ISIS/IGBMC, CNRS and Université de Strasbourg, Strasbourg, France
- Centre National de la Recherche Scientifique, UMR7104, Illkirch, France
- Institut National de la Santé et de la Recherche Médicale, U964, Illkirch, France
| | | | - Mandar M. Inamdar
- Department of Civil Engineering, Indian Institute of Technology Bombay, Mumbai 400076, India
- Corresponding author
| | - Daniel Riveline
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France
- Laboratory of Cell Physics ISIS/IGBMC, CNRS and Université de Strasbourg, Strasbourg, France
- Centre National de la Recherche Scientifique, UMR7104, Illkirch, France
- Institut National de la Santé et de la Recherche Médicale, U964, Illkirch, France
- Corresponding author
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5
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Saika S, Veldhuis N, Križaj D, Rahaman SO. Editorial: New Insights into Mechanotransduction by Immune Cells in Physiological and Pathological Conditions. Front Immunol 2022; 13:930362. [PMID: 35669790 PMCID: PMC9164129 DOI: 10.3389/fimmu.2022.930362] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 04/29/2022] [Indexed: 11/13/2022] Open
Affiliation(s)
- Shizuya Saika
- Department of Ophthalmology, Wakayama Medical University, Wakayama, Japan
| | - Nicholas Veldhuis
- Drug Discovery Biology Theme, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC, Australia
| | - David Križaj
- Department of Ophthalmology, University of Utah School of Medicine, Salt Lake City, UT, United States
| | - Shaik O. Rahaman
- Department of Nutrition and Food Science, University of Maryland, College Park, MD, United States
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6
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Thiagarajan R, Inamdar MM, Riveline D. Interplay between cell height variations and planar pulsations in epithelial monolayers. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2022; 45:49. [PMID: 35587840 DOI: 10.1140/epje/s10189-022-00201-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 04/21/2022] [Indexed: 06/15/2023]
Abstract
Biological tissues change their shapes through collective interactions of cells. This coordination sets length and time scales for dynamics where precision is essential, in particular during morphogenetic events. However, how these scales emerge remains unclear. Here, we address this question using the pulsatile domains observed in confluent epithelial MDCK monolayers where cells exhibit synchronous contraction and extension cycles of [Formula: see text] h duration and [Formula: see text] length scale. We report that the monolayer thickness changes gradually in space and time by more than twofold in order to counterbalance the contraction and extension of the incompressible cytoplasm. We recapitulate these pulsatile dynamics using a continuum model and show that incorporation of cell stiffness dependent height variations is critical both for generating temporal pulsations and establishing the domain size. We propose that this feedback between height and mechanics could be important in coordinating the length scales of tissue dynamics.
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Affiliation(s)
- Raghavan Thiagarajan
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France
- Laboratory of Cell Physics ISIS/IGBMC, CNRS, Université de Strasbourg, Strasbourg, France
- UMR7104, Centre National de la Recherche Scientifique, Illkirch, France
- U964, Institut National de la Santé et de la Recherche Médicale, Illkirch, France
| | - Mandar M Inamdar
- Department of Civil Engineering, Indian Institute of Technology Bombay, Mumbai, 400076, India.
| | - Daniel Riveline
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France.
- Laboratory of Cell Physics ISIS/IGBMC, CNRS, Université de Strasbourg, Strasbourg, France.
- UMR7104, Centre National de la Recherche Scientifique, Illkirch, France.
- U964, Institut National de la Santé et de la Recherche Médicale, Illkirch, France.
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7
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Huang J, Cochran JO, Fielding SM, Marchetti MC, Bi D. Shear-Driven Solidification and Nonlinear Elasticity in Epithelial Tissues. PHYSICAL REVIEW LETTERS 2022; 128:178001. [PMID: 35570431 DOI: 10.1103/physrevlett.128.178001] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 03/31/2022] [Indexed: 06/15/2023]
Abstract
Biological processes, from morphogenesis to tumor invasion, spontaneously generate shear stresses inside living tissue. The mechanisms that govern the transmission of mechanical forces in epithelia and the collective response of the tissue to bulk shear deformations remain, however, poorly understood. Using a minimal cell-based computational model, we investigate the constitutive relation of confluent tissues under simple shear deformation. We show that an initially undeformed fluidlike tissue acquires finite rigidity above a critical applied strain. This is akin to the shear-driven rigidity observed in other soft matter systems. Interestingly, shear-driven rigidity can be understood by a critical scaling analysis in the vicinity of the second order critical point that governs the liquid-solid transition of the undeformed system. We further show that a solidlike tissue responds linearly only to small strains and but then switches to a nonlinear response at larger stains, with substantial stiffening. Finally, we propose a mean-field formulation for cells under shear that offers a simple physical explanation of shear-driven rigidity and nonlinear response in a tissue.
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Affiliation(s)
- Junxiang Huang
- Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA
| | - James O Cochran
- Department of Physics, Durham University, Science Laboratories, South Road, Durham DH1 3LE, United Kingdom
| | - Suzanne M Fielding
- Department of Physics, Durham University, Science Laboratories, South Road, Durham DH1 3LE, United Kingdom
| | - M Cristina Marchetti
- Department of Physics, University of California, Santa Barbara, California 93106, USA
| | - Dapeng Bi
- Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA
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8
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Condensation of the Drosophila nerve cord is oscillatory and depends on coordinated mechanical interactions. Dev Cell 2022; 57:867-882.e5. [PMID: 35413236 DOI: 10.1016/j.devcel.2022.03.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 01/19/2022] [Accepted: 03/14/2022] [Indexed: 11/21/2022]
Abstract
During development, organs reach precise shapes and sizes. Organ morphology is not always obtained through growth; a classic counterexample is the condensation of the nervous system during Drosophila embryogenesis. The mechanics underlying such condensation remain poorly understood. Here, we characterize the condensation of the embryonic ventral nerve cord (VNC) at both subcellular and tissue scales. This analysis reveals that condensation is not a unidirectional continuous process but instead occurs through oscillatory contractions. The VNC mechanical properties spatially and temporally vary, and forces along its longitudinal axis are spatially heterogeneous. We demonstrate that the process of VNC condensation is dependent on the coordinated mechanical activities of neurons and glia. These outcomes are consistent with a viscoelastic model of condensation, which incorporates time delays and effective frictional interactions. In summary, we have defined the progressive mechanics driving VNC condensation, providing insights into how a highly viscous tissue can autonomously change shape and size.
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Khaw JS, Xue R, Cassidy NJ, Cartmell SH. Electrical stimulation of titanium to promote stem cell orientation, elongation and osteogenesis. Acta Biomater 2022; 139:204-217. [PMID: 34390847 DOI: 10.1016/j.actbio.2021.08.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 07/06/2021] [Accepted: 08/06/2021] [Indexed: 11/29/2022]
Abstract
Electrical stimulation of cells allows exogenous electric signals as stimuli to manipulate cell growth, preferential orientation and bone remodelling. In this study, commercially pure titanium discs were utilised in combination with a custom-built bioreactor to investigate the cellular responses of human mesenchymal stem cells via in-vitro functional assays. Finite element analysis revealed the homogeneous delivery of electric field in the bioreactor chamber with no detection of current density fluctuation in the proposed model. The custom-built bioreactor with capacitive stimulation delivery system features long-term stimulation with homogeneous electric field, biocompatible, sterilisable, scalable design and cost-effective in the manufacturing process. Using a continuous stimulation regime of 100 and 200 mV/mm on cp Ti discs, viability tests revealed up to an approximately 5-fold increase of cell proliferation rate as compared to non-stimulated controls. The human mesenchymal stem cells showed more elongated and differentiated morphology under this regime, with evidence of nuclear elongation and cytoskeletal orientation perpendicular to the direction of electric field. The continuous stimulation did not cause pH fluctuations and hydrogen peroxide production caused by Faradic reactions, signifying the suitability for long-term toxic free stimulation as opposed to the commonly used direct stimulation regime. An approximate of 4-fold increase in alkaline phosphatase production and approximately 9-fold increase of calcium deposition were observed on 200 mV/mm exposed samples relative to non-stimulated controls. It is worth noting that early stem cell differentiation and matrix production were observed under the said electric field even without the presence of chemical inductive growth factors. STATEMENT OF SIGNIFICANCE: This manuscript presents a study on combining pure titanium (primarily preferred as medical implant materials) and electrical stimulation in a purpose-built bioreactor with capacitive stimulation delivery system. A continuous capacitive stimulation regime on titanium disc has resulted in enhanced stem cell orientation, nuclei elongation, proliferation and differentiation as compared to non-stimulated controls. We believe that this manuscript creates a paradigm for future studies on the evolution of healthcare treatments in the area of targeted therapy on implantable and wearable medical devices through tailored innovative electrical stimulation approach, thereby influencing therapeutic conductive and electroactive biomaterials research prospects and development.
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Affiliation(s)
- Juan Shong Khaw
- The Henry Royce Institute, Royce Hub Building, The University of Manchester, Manchester M13 9PL, UK
| | - Ruikang Xue
- The Henry Royce Institute, Royce Hub Building, The University of Manchester, Manchester M13 9PL, UK
| | - Nigel J Cassidy
- Civil Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Sarah H Cartmell
- The Henry Royce Institute, Royce Hub Building, The University of Manchester, Manchester M13 9PL, UK.
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Inman A, Smutny M. Feeling the force: Multiscale force sensing and transduction at the cell-cell interface. Semin Cell Dev Biol 2021; 120:53-65. [PMID: 34238674 DOI: 10.1016/j.semcdb.2021.06.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 06/11/2021] [Accepted: 06/13/2021] [Indexed: 12/13/2022]
Abstract
A universal principle of all living cells is the ability to sense and respond to mechanical stimuli which is essential for many biological processes. Recent efforts have identified critical mechanosensitive molecules and response pathways involved in mechanotransduction during development and tissue homeostasis. Tissue-wide force transmission and local force sensing need to be spatiotemporally coordinated to precisely regulate essential processes during development such as tissue morphogenesis, patterning, cell migration and organogenesis. Understanding how cells identify and interpret extrinsic forces and integrate a specific response on cell and tissue level remains a major challenge. In this review we consider important cellular and physical factors in control of cell-cell mechanotransduction and discuss their significance for cell and developmental processes. We further highlight mechanosensitive macromolecules that are known to respond to external forces and present examples of how force responses can be integrated into cell and developmental programs.
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Affiliation(s)
- Angus Inman
- Centre for Mechanochemical Cell Biology and Division of Biomedical Sciences, Warwick Medical School, University of Warwick, Coventry CV47AL, UK
| | - Michael Smutny
- Centre for Mechanochemical Cell Biology and Division of Biomedical Sciences, Warwick Medical School, University of Warwick, Coventry CV47AL, UK.
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11
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Holcomb MC, Gao GJJ, Servati M, Schneider D, McNeely PK, Thomas JH, Blawzdziewicz J. Mechanical feedback and robustness of apical constrictions in Drosophila embryo ventral furrow formation. PLoS Comput Biol 2021; 17:e1009173. [PMID: 34228708 PMCID: PMC8284804 DOI: 10.1371/journal.pcbi.1009173] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 07/16/2021] [Accepted: 06/10/2021] [Indexed: 11/19/2022] Open
Abstract
Formation of the ventral furrow in the Drosophila embryo relies on the apical constriction of cells in the ventral region to produce bending forces that drive tissue invagination. In our recent paper we observed that apical constrictions during the initial phase of ventral furrow formation produce elongated patterns of cellular constriction chains prior to invagination and argued that these are indicative of tensile stress feedback. Here, we quantitatively analyze the constriction patterns preceding ventral furrow formation and find that they are consistent with the predictions of our active-granular-fluid model of a monolayer of mechanically coupled stress-sensitive constricting particles. Our model shows that tensile feedback causes constriction chains to develop along underlying precursor tensile stress chains that gradually strengthen with subsequent cellular constrictions. As seen in both our model and available optogenetic experiments, this mechanism allows constriction chains to penetrate or circumvent zones of reduced cell contractility, thus increasing the robustness of ventral furrow formation to spatial variation of cell contractility by rescuing cellular constrictions in the disrupted regions.
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Affiliation(s)
- Michael C. Holcomb
- Department of Physics and Astronomy, Texas Tech University, Lubbock, Texas, United States of America
| | - Guo-Jie Jason Gao
- Department of Mathematical and Systems Engineering, Shizuoka University, Hamamatsu, Japan
| | - Mahsa Servati
- Department of Physics and Astronomy, Texas Tech University, Lubbock, Texas, United States of America
| | - Dylan Schneider
- Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas, United States of America
| | - Presley K. McNeely
- Department of Physics and Astronomy, Texas Tech University, Lubbock, Texas, United States of America
| | - Jeffrey H. Thomas
- Department of Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock, Texas, United States of America
| | - Jerzy Blawzdziewicz
- Department of Physics and Astronomy, Texas Tech University, Lubbock, Texas, United States of America
- Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas, United States of America
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12
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Integrin Adhesion Complex Organization in Sheep Myometrium Reflects Changing Mechanical Forces during Pregnancy and Postpartum. BIOLOGY 2021; 10:biology10060508. [PMID: 34201059 PMCID: PMC8227588 DOI: 10.3390/biology10060508] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 05/20/2021] [Accepted: 06/03/2021] [Indexed: 11/17/2022]
Abstract
Simple Summary IACs assemble within the sheep myometrium during early-to-mid gestation in response to increased stretch of the uterine wall and continue to increase as pregnancy progresses. Fibronectin (FN1) is important in its ability to attach to IACs in myometrial cells to generate force to sustain powerful contractions during labor. After parturition, IACs are disassembled but the integrin subunits ITGA5 and ITGB1 remain expressed at the protein level at least two weeks postpartum. Abstract Cells respond to extracellular mechanical forces through the assembly of integrin adhesion complexes (IACs) that provide a scaffold through which cells sense and transduce responses to those forces. IACs are composed of transmembrane integrin receptors that bind to extracellular matrix (ECM) proteins externally and connect with the actomyosin cytoskeleton internally. Myometrial smooth muscle cells respond to forces that arise due to increases in fetal growth/weight, placental fluid volumes, and blood flow. As a result, the uterus transforms into an organ that can forcefully expel the fetus and placental membranes during parturition. While earlier studies focused on IAC expression in the myometrial compartment of rodents and humans to explore pregnancy-associated responses, the present study examines IAC assembly in ovine myometrium where mechanical forces are expected to be amplified in a manner similar to humans. Results indicate that the ITGA5 and ITGB1 heterodimers associate with the ECM protein FN1 externally, and with VCL and TLN1 internally, to form IACs in myometrial cells during the first trimester of pregnancy. These IACs become increasingly ordered until parturition. This ordered structure is lost by one day postpartum; however, the abundance of the integrin proteins remains elevated for at least two weeks postpartum. Implications of the present study are that sheep are similar to humans regarding the assembly of IACs in the pregnant myometrium and suggest that IACs may form much earlier in human gestation than was previously implied by the rat model. Results highlight the continued value of the sheep model as a flagship gynecological model for understanding parturition in humans.
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Comelles J, SS S, Lu L, Le Maout E, Anvitha S, Salbreux G, Jülicher F, Inamdar MM, Riveline D. Epithelial colonies in vitro elongate through collective effects. eLife 2021; 10:e57730. [PMID: 33393459 PMCID: PMC7850623 DOI: 10.7554/elife.57730] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 12/31/2020] [Indexed: 12/11/2022] Open
Abstract
Epithelial tissues of the developing embryos elongate by different mechanisms, such as neighbor exchange, cell elongation, and oriented cell division. Since autonomous tissue self-organization is influenced by external cues such as morphogen gradients or neighboring tissues, it is difficult to distinguish intrinsic from directed tissue behavior. The mesoscopic processes leading to the different mechanisms remain elusive. Here, we study the spontaneous elongation behavior of spreading circular epithelial colonies in vitro. By quantifying deformation kinematics at multiple scales, we report that global elongation happens primarily due to cell elongations, and its direction correlates with the anisotropy of the average cell elongation. By imposing an external time-periodic stretch, the axis of this global symmetry breaking can be modified and elongation occurs primarily due to orientated neighbor exchange. These different behaviors are confirmed using a vertex model for collective cell behavior, providing a framework for understanding autonomous tissue elongation and its origins.
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Affiliation(s)
- Jordi Comelles
- Laboratory of Cell Physics ISIS/IGBMC, CNRS and Université de StrasbourgStrasbourgFrance
- Institut de Génétique et de Biologie Moléculaire et CellulaireIllkirchFrance
- Centre National de la Recherche Scientifique, UMR7104IllkirchFrance
- Institut National de la Santé et de la Recherche Médicale, U964IllkirchFrance
| | - Soumya SS
- Department of Civil Engineering, Indian Institute of Technology Bombay, PowaiMumbaiIndia
| | - Linjie Lu
- Laboratory of Cell Physics ISIS/IGBMC, CNRS and Université de StrasbourgStrasbourgFrance
- Institut de Génétique et de Biologie Moléculaire et CellulaireIllkirchFrance
- Centre National de la Recherche Scientifique, UMR7104IllkirchFrance
- Institut National de la Santé et de la Recherche Médicale, U964IllkirchFrance
| | - Emilie Le Maout
- Laboratory of Cell Physics ISIS/IGBMC, CNRS and Université de StrasbourgStrasbourgFrance
- Institut de Génétique et de Biologie Moléculaire et CellulaireIllkirchFrance
- Centre National de la Recherche Scientifique, UMR7104IllkirchFrance
- Institut National de la Santé et de la Recherche Médicale, U964IllkirchFrance
| | - S Anvitha
- Department of Mechanical Engineering, Indian Institute of Technology Bombay, PowaiMumbaiIndia
| | | | - Frank Jülicher
- Max Planck Institute for the Physics of Complex SystemsDresdenGermany
- Cluster of Excellence Physics of LifeDresdenGermany
| | - Mandar M Inamdar
- Department of Civil Engineering, Indian Institute of Technology Bombay, PowaiMumbaiIndia
| | - Daniel Riveline
- Laboratory of Cell Physics ISIS/IGBMC, CNRS and Université de StrasbourgStrasbourgFrance
- Institut de Génétique et de Biologie Moléculaire et CellulaireIllkirchFrance
- Centre National de la Recherche Scientifique, UMR7104IllkirchFrance
- Institut National de la Santé et de la Recherche Médicale, U964IllkirchFrance
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14
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Potekhina Y, Filatova A, Tregubova E, Mokhov D. Mechanosensitivity of Cells and Its Role in the Regulation of Physiological Functions and the Implementation of Physiotherapeutic Effects (Review). Sovrem Tekhnologii Med 2020; 12:77-89. [PMID: 34795996 PMCID: PMC8596276 DOI: 10.17691/stm2020.12.4.10] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Indexed: 01/11/2023] Open
Abstract
Regulatory signals in the body are not limited to chemical and electrical ones. There is another type of important signals for cells: those are mechanical signals (coming from the environment or arising from within the body), which have been less known in the literature. The review summarizes new information on the mechanosensitivity of various cells of connective tissue and nervous system. Participation of mechanical stimuli in the regulation of growth, development, differentiation, and functioning of tissues is described. The data focus on bone remodeling, wound healing, neurite growth, and the formation of neural networks. Mechanotransduction, cellular organelles, and mechanosensitive molecules involved in these processes are discussed as well as the role of the extracellular matrix. The importance of mechanical characteristics of cells in the pathogenesis of diseases is highlighted. Finally, the possible role of mechanosensitivity in mediating the physiotherapeutic effects is addressed.
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Affiliation(s)
- Yu.P. Potekhina
- Professor, Department of Normal Physiology named after N.Y. Belenkov; Privolzhsky Research Medical University, 10/1 Minin and Pozharsky Square, Nizhny Novgorod, 603005, Russia
| | - A.I. Filatova
- Student, Faculty of Pediatrics; Privolzhsky Research Medical University, 10/1 Minin and Pozharsky Square, Nizhny Novgorod, 603005, Russia
| | - E.S. Tregubova
- Professor, Department of Osteopathy; North-Western State Medical University named after I.I. Mechnikov, 41 Kirochnaya St., Saint Petersburg, 191015, Russia; Associate Professor, Institute of Osteopathy; Saint Petersburg State University, 7/9 Universitetskaya naberezhnaya, Saint Petersburg, 199034, Russia
| | - D.E. Mokhov
- Head of the Department of Osteopathy; North-Western State Medical University named after I.I. Mechnikov, 41 Kirochnaya St., Saint Petersburg, 191015, Russia; Director of the Institute of Osteopathy Saint Petersburg State University, 7/9 Universitetskaya naberezhnaya, Saint Petersburg, 199034, Russia
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15
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da Silva Madaleno C, Jatzlau J, Knaus P. BMP signalling in a mechanical context - Implications for bone biology. Bone 2020; 137:115416. [PMID: 32422297 DOI: 10.1016/j.bone.2020.115416] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 05/11/2020] [Accepted: 05/12/2020] [Indexed: 01/12/2023]
Abstract
Bone Morphogenetic Proteins (BMPs) are extracellular multifunctional signalling cytokines and members of the TGFβ super family. These pleiotropic growth factors crucially promote bone formation, remodeling and healing after injury. Additionally, bone homeostasis is systematically regulated by mechanical inputs from the environment, which are incorporated into the bone cells' biochemical response. These inputs range from compression and tension induced by the movement of neighboring muscle, to fluid shear stress induced by interstitial fluid flow in the canaliculi and in the vascular system. Although BMPs are widely applied in a clinic context to promote fracture healing, it is still elusive how mechanical inputs modulate this signalling pathway, hindering an efficient and side-effect free application of these ligands in bone healing. This review aims to summarize the current understanding in how mechanical cues (tension, compression, shear force and hydrostatic pressure) and substrate stiffness modulate BMP signalling. We highlight the time-dependent effects in modulating immediate early up to long-term effects of mechano-BMP crosstalk during bone formation and remodeling, considering the interplay with other already established mechanosensitive pathways, such as MRTF/SRF and Hippo signalling.
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Affiliation(s)
- Carolina da Silva Madaleno
- Institute for Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany; Berlin Brandenburg School of Regenerative Therapies (BSRT), Charité Universitätsmedizin, Berlin, Germany
| | - Jerome Jatzlau
- Institute for Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Petra Knaus
- Institute for Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany; Berlin Brandenburg School of Regenerative Therapies (BSRT), Charité Universitätsmedizin, Berlin, Germany.
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16
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Seo H, Li X, Wu G, Bazer FW, Burghardt RC, Bayless KJ, Johnson GA. Mechanotransduction drives morphogenesis to develop folding during placental development in pigs. Placenta 2019; 90:62-70. [PMID: 32056554 DOI: 10.1016/j.placenta.2019.12.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 11/20/2019] [Accepted: 12/11/2019] [Indexed: 12/11/2022]
Abstract
INTRODUCTION Our aim was to evaluate whether mechanical forces applied to the placenta of pigs correlate with morphological changes that coordinate the development of placental folds. METHODS We examined changes in the length of placental folds, expression of mechanotransduction-implicated molecules in placental tissues, changes in the size of subepithelial blood vessels within the endometrium, and effects of in vivo supplementation with arginine on fold development. RESULTS We observed that: 1) the length of folds increased 2) osteopontin, talin and focal adhesion kinase co-localized into aggregates at the maternal placental (uterine)-fetal placental interface; 3) filamin, actin related protein 2, and F-actin were enriched in the tops of maternal placental folds extending into fetal placental tissue; 4) maternal stromal fibroblasts acquired alpha smooth muscle actin; 5) endometrial blood vessels increased in size; and 6) supplementation with arginine increased fold length. CONCLUSION Results indicate that lengthening of folds associates with polymerization of actin that coincides with FA assembly, endometrial fibroblasts differentiate into myofibroblasts, and dilation of subepithelial blood vessels correlates with development of folds that is enhanced by arginine. We propose that dilation of subepithelial endometrial blood vessels delivers increased blood flow that pushes upward on the interface between the uterine luminal epithelium (LE) and the placental chorionic epithelium (CE), protrusive forces from growing uterine blood vessels trigger focal adhesion assembly and actin polymerization between the LE and CE, and endometrial fibroblasts differentiate into contractile myofibroblasts that pull connective tissue downward and inward to sculpt folds at the maternal placental-fetal placental interface.
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Affiliation(s)
- Heewon Seo
- Department of Veterinary Integrative Biosciences, College Station, TX, 77843, USA
| | - Xilong Li
- Department of Animal Science, Texas A&M University, College Station, TX, 77843, USA
| | - Guoyao Wu
- Department of Animal Science, Texas A&M University, College Station, TX, 77843, USA
| | - Fuller W Bazer
- Department of Animal Science, Texas A&M University, College Station, TX, 77843, USA
| | - Robert C Burghardt
- Department of Veterinary Integrative Biosciences, College Station, TX, 77843, USA
| | - Kayla J Bayless
- Department of Molecular & Cellular Medicine, Texas A&M System Health Sciences Center, College Station, TX, 77843, USA
| | - Greg A Johnson
- Department of Veterinary Integrative Biosciences, College Station, TX, 77843, USA.
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17
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Wei WC, Bianchi F, Wang YK, Tang MJ, Ye H, Glitsch MD. Coincidence Detection of Membrane Stretch and Extracellular pH by the Proton-Sensing Receptor OGR1 (GPR68). Curr Biol 2018; 28:3815-3823.e4. [PMID: 30471999 DOI: 10.1016/j.cub.2018.10.046] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Revised: 09/05/2018] [Accepted: 10/19/2018] [Indexed: 12/24/2022]
Abstract
The physical environment critically affects cell shape, proliferation, differentiation, and survival by exerting mechanical forces on cells. These forces are sensed and transduced into intracellular signals and responses by cells. A number of different membrane and cytoplasmic proteins have been implicated in sensing mechanical forces, but the picture is far from complete, and the exact transduction pathways remain largely elusive. Furthermore, mechanosensation takes place alongside chemosensation, and cells need to integrate physical and chemical signals to respond appropriately and ensure normal tissue and organ development and function. Here, we report that ovarian cancer G protein coupled receptor 1 (OGR1) (aka GPR68) acts as coincidence detector of membrane stretch and its physiological ligand, extracellular H+. Using fluorescence imaging, substrates of different stiffness, microcontact printing methods, and cell-stretching techniques, we show that OGR1 only responds to extracellular acidification under conditions of membrane stretch and vice versa. The level of OGR1 activity mirrors the extent of membrane stretch and degree of extracellular acidification. Furthermore, actin polymerization in response to membrane stretch is critical for OGR1 activity, and its depolymerization limits how long OGR1 remains responsive following a stretch event, thus providing a "memory" for past stretch. Cells experience changes in membrane stretch and extracellular pH throughout their lifetime. Because OGR1 is a widely expressed receptor, it represents a unique yet widespread mechanism that enables cells to respond dynamically to mechanical and pH changes in their microenvironment by integrating these chemical and physical stimuli at the receptor level.
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Affiliation(s)
- Wei-Chun Wei
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3PT, UK
| | - Fabio Bianchi
- Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Oxford OX3 7DQ, UK
| | - Yang-Kao Wang
- Department of Cell Biology and Anatomy, College of Medicine, National Cheng Kung University, Tainan 70101, Taiwan
| | - Ming-Jer Tang
- Department of Physiology, College of Medicine and International Center for Wound Repair and Regeneration, National Cheng Kung University, Tainan 70101, Taiwan
| | - Hua Ye
- Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Oxford OX3 7DQ, UK
| | - Maike D Glitsch
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3PT, UK.
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18
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Gangatharan G, Schneider-Maunoury S, Breau MA. Role of mechanical cues in shaping neuronal morphology and connectivity. Biol Cell 2018; 110:125-136. [PMID: 29698566 DOI: 10.1111/boc.201800003] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2018] [Accepted: 04/09/2018] [Indexed: 02/06/2023]
Abstract
Neuronal circuits, the functional building blocks of the nervous system, assemble during development through a series of dynamic processes including the migration of neurons to their final position, the growth and navigation of axons and their synaptic connection with target cells. While the role of chemical cues in guiding neuronal migration and axonal development has been extensively analysed, the contribution of mechanical inputs, such as forces and stiffness, has received far less attention. In this article, we review the in vitro and more recent in vivo studies supporting the notion that mechanical signals are critical for multiple aspects of neuronal circuit assembly, from the emergence of axons to the formation of functional synapses. By combining live imaging approaches with tools designed to measure and manipulate the mechanical environment of neurons, the emerging field of neuromechanics will add a new paradigm in our understanding of neuronal development and potentially inspire novel regenerative therapies.
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Affiliation(s)
- Girisaran Gangatharan
- Sorbonne Université, CNRS UMR 7622, Laboratoire de Biologie du Développement-Institut de Biologie Paris Seine (LBD-IBPS), INSERM, Paris, 75005, France
| | - Sylvie Schneider-Maunoury
- Sorbonne Université, CNRS UMR 7622, Laboratoire de Biologie du Développement-Institut de Biologie Paris Seine (LBD-IBPS), INSERM, Paris, 75005, France
| | - Marie Anne Breau
- Sorbonne Université, CNRS UMR 7622, Laboratoire de Biologie du Développement-Institut de Biologie Paris Seine (LBD-IBPS), INSERM, Paris, 75005, France.,Sorbonne Université, CNRS UMR 8237, Laboratoire Jean Perrin, Paris, 75005, France
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19
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Letizia A, Tosi S, Llimargas M. Morphogenetic movements affect local tissue organisation during embryonic Drosophila morphogenesis. Eur J Cell Biol 2018; 97:243-256. [DOI: 10.1016/j.ejcb.2018.03.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Revised: 03/04/2018] [Accepted: 03/13/2018] [Indexed: 11/28/2022] Open
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20
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Schwarz C, Ott CE, Wulsten D, Brauer E, Schreivogel S, Petersen A, Hassanein K, Roewer L, Schmidt T, Willie BM, Duda GN. The Interaction of BMP2-Induced Defect Healing in Rat and Fixator Stiffness Modulates Matrix Alignment and Contraction. JBMR Plus 2018; 2:174-186. [PMID: 30283901 PMCID: PMC6124159 DOI: 10.1002/jbm4.10031] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 12/14/2017] [Accepted: 12/27/2017] [Indexed: 12/15/2022] Open
Abstract
Successful fracture healing requires a tight interplay between mechanical and biological cues. In vitro studies illustrated that mechanical loading modulates bone morphogenetic protein (BMP) signaling. However, in the early phases of large bone defect regeneration in vivo, the underlying mechanisms leading to this mechanosensation remained unknown. We investigated the interaction of BMP2 stimulation and mechanical boundary conditions in a rat critical‐sized femoral defect model (5 mm) stabilized with three distinctly different external fixator stiffness. Defects were treated with 5 μg rhBMP2 loaded on an absorbable collagen sponge. Early matrix alignment was monitored by second‐harmonic generation imaging. Bony bridging of defects and successive healing was monitored by histology at day 7 and day 14 as well as in vivo microCT at days 10, 21, and 42 post‐operation. Femora harvested at day 42 were characterized mechanically assessing torsional load to failure ex vivo. At tissue level, differences between groups were visible at day 14 with manifest bone formation in the microCT. Histologically, we observed prolonged chondrogenesis upon flexible fixation, whereas osteogenesis started earlier after rigid and semirigid fixation. At later time points, there was a boost of bone tissue formation upon flexible fixation, whereas other groups already displayed signs of tissue maturation. Based on gene expression profiling, we analyzed the mechanobiological interplay. Already at day 3, these analyses revealed differences in expression pattern, specifically of genes involved in extracellular matrix formation. Gene regulation correlating with fixator stiffness was pronounced at day 7 comprising genes related to immunological processes and cellular contraction. The influence of loading on matrix contraction was further investigated and confirmed in a 3D bioreactor. Taken together, we demonstrate an early onset of mechanical conditions influencing BMP2‐induced defect healing and shed light on gene regulatory networks associated with extracellular matrix organization and contraction that seemed to directly impact healing outcomes. © 2018 The Authors. JBMR Plus is published by Wiley Periodicals, Inc. on behalf of the American Society for Bone and Mineral Research.
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Affiliation(s)
- Carolin Schwarz
- Julius Wolff Institute and Center for Musculoskeletal Surgery Charité - Universitätsmedizin Berlin corporate member of Freie Universität Berlin Humboldt-Universität zu Berlin and Berlin Institute of Health Berlin Germany.,Berlin-Brandenburg Center for Regenerative Therapies (BCRT) Charité - Universitätsmedizin Berlin corporate member of Freie Universität Berlin Humboldt-Universität zu Berlin and Berlin Institute of Health Berlin Germany
| | - Claus-Eric Ott
- Institute for Medical Genetics and Human Genetics Charité - Universitätsmedizin Berlin corporate member of Freie Universität Berlin Humboldt-Universität zu Berlin and Berlin Institute of Health Berlin Germany.,Research Group Development and Disease Max Planck Institute for Molecular Genetics Berlin Germany
| | - Dag Wulsten
- Julius Wolff Institute and Center for Musculoskeletal Surgery Charité - Universitätsmedizin Berlin corporate member of Freie Universität Berlin Humboldt-Universität zu Berlin and Berlin Institute of Health Berlin Germany
| | - Erik Brauer
- Julius Wolff Institute and Center for Musculoskeletal Surgery Charité - Universitätsmedizin Berlin corporate member of Freie Universität Berlin Humboldt-Universität zu Berlin and Berlin Institute of Health Berlin Germany
| | - Sophie Schreivogel
- Julius Wolff Institute and Center for Musculoskeletal Surgery Charité - Universitätsmedizin Berlin corporate member of Freie Universität Berlin Humboldt-Universität zu Berlin and Berlin Institute of Health Berlin Germany
| | - Ansgar Petersen
- Julius Wolff Institute and Center for Musculoskeletal Surgery Charité - Universitätsmedizin Berlin corporate member of Freie Universität Berlin Humboldt-Universität zu Berlin and Berlin Institute of Health Berlin Germany.,Berlin-Brandenburg Center for Regenerative Therapies (BCRT) Charité - Universitätsmedizin Berlin corporate member of Freie Universität Berlin Humboldt-Universität zu Berlin and Berlin Institute of Health Berlin Germany
| | - Kerstin Hassanein
- Julius Wolff Institute and Center for Musculoskeletal Surgery Charité - Universitätsmedizin Berlin corporate member of Freie Universität Berlin Humboldt-Universität zu Berlin and Berlin Institute of Health Berlin Germany
| | - Linda Roewer
- Julius Wolff Institute and Center for Musculoskeletal Surgery Charité - Universitätsmedizin Berlin corporate member of Freie Universität Berlin Humboldt-Universität zu Berlin and Berlin Institute of Health Berlin Germany
| | - Tanja Schmidt
- Julius Wolff Institute and Center for Musculoskeletal Surgery Charité - Universitätsmedizin Berlin corporate member of Freie Universität Berlin Humboldt-Universität zu Berlin and Berlin Institute of Health Berlin Germany.,Berlin-Brandenburg Center for Regenerative Therapies (BCRT) Charité - Universitätsmedizin Berlin corporate member of Freie Universität Berlin Humboldt-Universität zu Berlin and Berlin Institute of Health Berlin Germany
| | - Bettina M Willie
- Research Center Shriners Hospitals for Children-Canada Department of Pediatric Surgery McGill University Montreal Canada
| | - Georg N Duda
- Julius Wolff Institute and Center for Musculoskeletal Surgery Charité - Universitätsmedizin Berlin corporate member of Freie Universität Berlin Humboldt-Universität zu Berlin and Berlin Institute of Health Berlin Germany.,Berlin-Brandenburg Center for Regenerative Therapies (BCRT) Charité - Universitätsmedizin Berlin corporate member of Freie Universität Berlin Humboldt-Universität zu Berlin and Berlin Institute of Health Berlin Germany
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21
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Breau MA, Schneider-Maunoury S. [Stretch-induced axon growth: a universal, yet poorly explored process]. Biol Aujourdhui 2018; 211:215-222. [PMID: 29412131 DOI: 10.1051/jbio/2017028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2017] [Indexed: 12/21/2022]
Abstract
The growth of axons is a key step in neuronal circuit assembly. The axon starts elongating with the migration of its growth cone in response to molecular signals present in the surrounding embryonic tissues. Following the formation of a synapse between the axon and the target cell, the distance which separates the cell body from the synapse continues to increase to accommodate the growth of the organism. This second phase of elongation, which is universal and crucial since it contributes to an important proportion of the final axon size, has been historically referred to as "stretch-induced axon growth". It is indeed likely to result from a mechanical tension generated by the growth of the body, but the underlying mechanisms remain poorly characterized. This article reviews the experimental studies of this process, mainly analysed on cultured neurons so far. The recent development of in vivo imaging techniques and tools to probe and perturb mechanical forces within embryos will shed new light on this universal mode of axonal growth. This knowledge may inspire the design of novel tissue engineering strategies dedicated to brain and spinal cord repair.
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Affiliation(s)
- Marie Anne Breau
- Institut de Biologie Paris-Seine (IBPS), Laboratoire de Biologie du Développement, CNRS UMR7622, INSERM U1156, 75005 Paris, France - Sorbonne Universités, UPMC Université Paris 06, 75005 Paris, France
| | - Sylvie Schneider-Maunoury
- Institut de Biologie Paris-Seine (IBPS), Laboratoire de Biologie du Développement, CNRS UMR7622, INSERM U1156, 75005 Paris, France - Sorbonne Universités, UPMC Université Paris 06, 75005 Paris, France
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22
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Lisowska J, Rödel CJ, Manet S, Miroshnikova YA, Boyault C, Planus E, De Mets R, Lee HH, Destaing O, Mertani H, Boulday G, Tournier-Lasserve E, Balland M, Abdelilah-Seyfried S, Albiges-Rizo C, Faurobert E. Cerebral Cavernous Malformation 1/2 complex controls ROCK1 and ROCK2 complementary functions for endothelial integrity. J Cell Sci 2018; 131:jcs.216093. [DOI: 10.1242/jcs.216093] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 07/03/2018] [Indexed: 12/30/2022] Open
Abstract
Endothelial integrity relies on a mechanical crosstalk between intercellular and cell-matrix interactions. This cross-talk is compromised in hemorrhagic vascular lesions of patients carrying loss-of-function mutations in CCM genes. RhoA/ROCK-dependent cytoskeletal remodeling is central to the disease as it causes unbalanced cell adhesion towards increased cell-extracellular matrix adhesions and destabilized cell-cell junctions. Our study reveals that CCM proteins directly orchestrate ROCK1 and ROCK2 complementary roles on the mechanics of the endothelium. CCM proteins act as a scaffold promoting ROCK2 interactions with VE-cadherin and limiting ROCK1 kinase activity. Loss of CCM1 produces excessive ROCK1-dependent actin stress fibers and destabilizes intercellular junctions. Silencing of ROCK1 but not ROCK2 restores the adhesive and mechanical homeostasis of CCM1/2-depleted endothelial monolayers and rescues cardiovascular defects of ccm1 mutant zebrafish embryos. Conversely, knocking down of Rock2 but not Rock1 in WT zebrafish embryos generates defects reminiscent of the ccm1 mutant phenotypes. Our study uncovers the role of the CCM complex in controlling ROCK1 and ROCK2 to preserve endothelial integrity and drive heart morphogenesis. Moreover, it identifies solely the ROCK1 isoform as therapeutic target for the CCM disease.
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Affiliation(s)
- Justyna Lisowska
- INSERM U1209, Institute for Advanced Biosciences, F-38700 La Tronche, France
- Université Grenoble Alpes , F-38042 Grenoble, France
- CNRS UMR 5309, Institute for Advanced Biosciences F-38700 La Tronche, France
| | - Claudia Jasmin Rödel
- Institute of Biochemistry and Biology, Potsdam University, D-14476 Potsdam, Germany
| | - Sandra Manet
- INSERM U1209, Institute for Advanced Biosciences, F-38700 La Tronche, France
- Université Grenoble Alpes , F-38042 Grenoble, France
- CNRS UMR 5309, Institute for Advanced Biosciences F-38700 La Tronche, France
| | - Yekaterina A. Miroshnikova
- INSERM U1209, Institute for Advanced Biosciences, F-38700 La Tronche, France
- Université Grenoble Alpes , F-38042 Grenoble, France
- CNRS UMR 5309, Institute for Advanced Biosciences F-38700 La Tronche, France
| | - Cyril Boyault
- INSERM U1209, Institute for Advanced Biosciences, F-38700 La Tronche, France
- Université Grenoble Alpes , F-38042 Grenoble, France
- CNRS UMR 5309, Institute for Advanced Biosciences F-38700 La Tronche, France
| | - Emmanuelle Planus
- INSERM U1209, Institute for Advanced Biosciences, F-38700 La Tronche, France
- Université Grenoble Alpes , F-38042 Grenoble, France
- CNRS UMR 5309, Institute for Advanced Biosciences F-38700 La Tronche, France
| | - Richard De Mets
- Université Grenoble Alpes , F-38042 Grenoble, France
- CNRS UMR 5588 LIPhy, F-38041 Grenoble, France
| | - Hsiao-Hui Lee
- Department of Life Sciences & Institute of Genome Sciences, National Yang-Ming University, Taipei City 112, Taiwan
| | - Olivier Destaing
- INSERM U1209, Institute for Advanced Biosciences, F-38700 La Tronche, France
- Université Grenoble Alpes , F-38042 Grenoble, France
- CNRS UMR 5309, Institute for Advanced Biosciences F-38700 La Tronche, France
| | - Hichem Mertani
- INSERM UMR 1052, CNRS 5286 CRCL Centre Léon Bérard F-69373 Lyon Cedex 08, France
| | - Gwénola Boulday
- INSERM, UMR-S1161, Paris, F-75010, France
- Univ Paris Diderot, Sorbonne Paris Cité, UMR-S1161, Paris, F-75010, France
- AP-HP, Groupe hospitalier Saint-Louis Lariboisiere-Fernand-Widal, Paris, F-75010, France
| | - Elisabeth Tournier-Lasserve
- INSERM, UMR-S1161, Paris, F-75010, France
- Univ Paris Diderot, Sorbonne Paris Cité, UMR-S1161, Paris, F-75010, France
- AP-HP, Groupe hospitalier Saint-Louis Lariboisiere-Fernand-Widal, Paris, F-75010, France
| | - Martial Balland
- Université Grenoble Alpes , F-38042 Grenoble, France
- CNRS UMR 5588 LIPhy, F-38041 Grenoble, France
| | - Salim Abdelilah-Seyfried
- Institute of Biochemistry and Biology, Potsdam University, D-14476 Potsdam, Germany
- Institute of Molecular Biology, Hannover Medical School, D-30625 Hannover, Germany
| | - Corinne Albiges-Rizo
- INSERM U1209, Institute for Advanced Biosciences, F-38700 La Tronche, France
- Université Grenoble Alpes , F-38042 Grenoble, France
- CNRS UMR 5309, Institute for Advanced Biosciences F-38700 La Tronche, France
| | - Eva Faurobert
- INSERM U1209, Institute for Advanced Biosciences, F-38700 La Tronche, France
- Université Grenoble Alpes , F-38042 Grenoble, France
- CNRS UMR 5309, Institute for Advanced Biosciences F-38700 La Tronche, France
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Fu R, Jiang X, Huang Z, Zhang H. The spectraplakins of Caenorhabditis elegans : Cytoskeletal crosslinkers and beyond. Semin Cell Dev Biol 2017; 69:58-68. [DOI: 10.1016/j.semcdb.2017.06.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 06/04/2017] [Accepted: 06/10/2017] [Indexed: 02/07/2023]
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24
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Murakami F, Ando Y, Miyagi A, Sugita S, Ueno N, Matsumoto T. Measurement of surface topography and stiffness distribution on cross-section of Xenopus laevis tailbud for estimation of mechanical environment in embryo. Dev Growth Differ 2017. [PMID: 28627765 DOI: 10.1111/dgd.12372] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The stress distribution inside a Xenopus laevis tailbud embryo was estimated to examine the cause of the straightening and elongation. The embryos were cut in the middle, yielding a cross-section perpendicular to the body axis. The section was not flat, owing to the residual stress relief. The stress needed to restore the flatness corresponded to the stress inside the embryo and was calculated using the surface topography and Young's-moduli in the section. We found the areas of the notochord (Nc), neural tube (NT), and abdominal tissue (AT) bulged in the cross-section, which revealed that compressive forces acted in these tissues. The moduli of the Nc, NT, and AT were in the order of several thousand, hundred, and tens of pascals, respectively. In the Nc, the compressive force was largest and increased with the development, suggesting Nc playing a central role in the elongation. The bending moment generated by the AT was 10 times higher than that by the Nc in the early stages of the tailbud formation, and the two were similar in the latter stages, suggesting that the compressive force in the AT was the major cause of the straightening during the early stage. The straightening and elongation could be orchestrated by changes in the compressive forces acting on the Nc, NT, and AT over time. For the sake of simplicity, we calculated the compressive force only and neglected the tensile force. Thus, it should be noted that the amount of the compressive force was somewhat overestimated.
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Affiliation(s)
- Fumiaki Murakami
- Biomechanics Laboratory, Department of Mechanical Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan
| | - Yoriko Ando
- Biomechanics Laboratory, Department of Mechanical Science and Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
| | - Asuka Miyagi
- Division for Morphogenesis, Department of Developmental Biology, National Institute for Basic Biology, 38 Nishigonaka, Myodaiji, Okazaki, Aichi, 444-8585, Japan.,Department of Basic Biology, School of life Science, The Graduate University of Advanced Studies (SOKENDAI), 38 Nishigonaka, Myodaiji, Okazaki, Aichi, 444-8585, Japan
| | - Shukei Sugita
- Biomechanics Laboratory, Department of Mechanical Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan
| | - Naoto Ueno
- Division for Morphogenesis, Department of Developmental Biology, National Institute for Basic Biology, 38 Nishigonaka, Myodaiji, Okazaki, Aichi, 444-8585, Japan.,Department of Basic Biology, School of life Science, The Graduate University of Advanced Studies (SOKENDAI), 38 Nishigonaka, Myodaiji, Okazaki, Aichi, 444-8585, Japan
| | - Takeo Matsumoto
- Biomechanics Laboratory, Department of Mechanical Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan
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25
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Abbas Y, Oefner CM, Polacheck WJ, Gardner L, Farrell L, Sharkey A, Kamm R, Moffett A, Oyen ML. A microfluidics assay to study invasion of human placental trophoblast cells. J R Soc Interface 2017; 14:20170131. [PMID: 28566515 PMCID: PMC5454302 DOI: 10.1098/rsif.2017.0131] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Accepted: 05/04/2017] [Indexed: 12/22/2022] Open
Abstract
Pre-eclampsia, fetal growth restriction and stillbirth are major pregnancy disorders throughout the world. The underlying pathogenesis of these diseases is defective placentation characterized by inadequate invasion of extravillous placental trophoblast cells into the uterine arteries. How trophoblast invasion is controlled remains an unanswered question but is influenced by maternal uterine immune cells called decidual natural killer cells. Here, we describe an in vitro microfluidic invasion assay to study the migration of primary human trophoblast cells. Each experiment can be performed with a small number of cells making it possible to conduct research on human samples despite the challenges of isolating primary trophoblast cells. Cells are exposed to a chemical gradient and tracked in a three-dimensional microenvironment using real-time high-resolution imaging, so that dynamic readouts on cell migration such as directionality, motility and velocity are obtained. The microfluidic system was validated using isolated trophoblast and a gradient of granulocyte-macrophage colony-stimulating factor, a cytokine produced by activated decidual natural killer cells. This microfluidic model provides detailed analysis of the dynamics of trophoblast migration compared to previous assays and can be modified in future to study in vitro how human trophoblast behaves during placentation.
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Affiliation(s)
- Yassen Abbas
- The Nanoscience Centre, Department of Engineering, University of Cambridge, Cambridge CB3 0FF, UK
- Department of Pathology, University of Cambridge, Cambridge CB2 1QP, UK
- Centre for Trophoblast Research (CTR), Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3EG, UK
| | - Carolin Melati Oefner
- The Nanoscience Centre, Department of Engineering, University of Cambridge, Cambridge CB3 0FF, UK
- Department of Pathology, University of Cambridge, Cambridge CB2 1QP, UK
- Centre for Trophoblast Research (CTR), Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3EG, UK
| | | | - Lucy Gardner
- Department of Pathology, University of Cambridge, Cambridge CB2 1QP, UK
| | - Lydia Farrell
- Department of Pathology, University of Cambridge, Cambridge CB2 1QP, UK
| | - Andrew Sharkey
- Department of Pathology, University of Cambridge, Cambridge CB2 1QP, UK
| | - Roger Kamm
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Ashley Moffett
- Department of Pathology, University of Cambridge, Cambridge CB2 1QP, UK
- Centre for Trophoblast Research (CTR), Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3EG, UK
| | - Michelle L Oyen
- The Nanoscience Centre, Department of Engineering, University of Cambridge, Cambridge CB3 0FF, UK
- Centre for Trophoblast Research (CTR), Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3EG, UK
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26
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Ferreira RR, Vermot J. The balancing roles of mechanical forces during left-right patterning and asymmetric morphogenesis. Mech Dev 2017; 144:71-80. [DOI: 10.1016/j.mod.2016.11.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 11/03/2016] [Indexed: 11/17/2022]
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27
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Frank JW, Seo H, Burghardt RC, Bayless KJ, Johnson GA. ITGAV (alpha v integrins) bind SPP1 (osteopontin) to support trophoblast cell adhesion. Reproduction 2017; 153:695-706. [PMID: 28250242 DOI: 10.1530/rep-17-0043] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 01/23/2017] [Accepted: 02/28/2017] [Indexed: 02/05/2023]
Abstract
Attachment of the conceptus trophoblast (Tr) to the uterine luminal epithelium (LE) is critical for successful implantation. This study determined whether alpha v (av) integrins (ITGAV) directly mediate porcine trophoblast cell adhesion to secreted phosphoprotein 1 (SPP1, also known as osteopontin (OPN)) and examined the temporal/spatial expression of ITGAV, beta 3 (b3, ITGB3) and beta 6 (b6, ITGB6) integrin subunits, and SPP1, at the uterine-placental interface of pigs. Knockdown of ITGAV in porcine Tr (pTr2) cells by siRNA reduced pTr2 attachment to SPP1. In situ hybridization confirmed the presence of ITGAV, ITGB3 and ITGB6 mRNAs in uterine LE and conceptus Tr between Days 9 and 60 of gestation, with no change in the magnitude of expression over the course of pregnancy. Exogenous E2 or P4 did not affect ITGAV, ITGB3 and ITGB6 mRNA expression in the uteri of ovariectomized gilts. Immunofluorescence identified ITGAV, ITGB3 and SPP1 proteins in large aggregates at the uterine LE-placental Tr/chorion interface on Day 25, but aggregates were no longer observed by Day 50 of gestation. These results are the first to directly demonstrate that pTr2 cells engage ITGAV-containing integrin receptors to adhere to SPP1 and suggest that mechanical forces generated by tethering elongating conceptuses to uterine LE leads to assembly of focal adhesions containing ITGAV and SPP1; however, as placentation progresses, subsequent folding/interdigitation at the uterine-placental interface disperses mechanical forces resulting in the loss of focal adhesions.
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Affiliation(s)
- James W Frank
- Department of Veterinary Integrative BiosciencesCollege of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, USA
| | - Heewon Seo
- Department of Veterinary Integrative BiosciencesCollege of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, USA
| | - Robert C Burghardt
- Department of Veterinary Integrative BiosciencesCollege of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, USA
| | - Kayla J Bayless
- Department of Molecular and Cellular MedicineTexas A&M Health Science Center, College Station, Bryan, USA
| | - Greg A Johnson
- Department of Veterinary Integrative BiosciencesCollege of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, USA
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28
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Vuong-Brender TTK, Ben Amar M, Pontabry J, Labouesse M. The interplay of stiffness and force anisotropies drives embryo elongation. eLife 2017; 6. [PMID: 28181905 PMCID: PMC5371431 DOI: 10.7554/elife.23866] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Accepted: 01/27/2017] [Indexed: 12/31/2022] Open
Abstract
The morphogenesis of tissues, like the deformation of an object, results from the interplay between their material properties and the mechanical forces exerted on them. The importance of mechanical forces in influencing cell behaviour is widely recognized, whereas the importance of tissue material properties, in particular stiffness, has received much less attention. Using Caenorhabditis elegans as a model, we examine how both aspects contribute to embryonic elongation. Measuring the opening shape of the epidermal actin cortex after laser nano-ablation, we assess the spatiotemporal changes of actomyosin-dependent force and stiffness along the antero-posterior and dorso-ventral axis. Experimental data and analytical modelling show that myosin-II-dependent force anisotropy within the lateral epidermis, and stiffness anisotropy within the fiber-reinforced dorso-ventral epidermis are critical in driving embryonic elongation. Together, our results establish a quantitative link between cortical tension, material properties and morphogenesis of an entire embryo. DOI:http://dx.doi.org/10.7554/eLife.23866.001 Animals come in all shapes and size, from ants to elephants. In all cases, the tissues and organs in the animal’s body acquire their shape as the animal develops. Cells in developing tissues squeeze themselves or push and pull on one another, and the resulting forces generate the final shape. This process is called morphogenesis and it is often studied in a worm called Caenorhabditis elegans. This worm’s simplicity makes it easy to work with in the laboratory. Yet processes that occur in C. elegans also take place in other animals, including humans, and so the discoveries made using this worm can have far-reaching implications. As they develop, the embryos of C. elegans transform from a bean-shaped cluster of cells into the characteristic long shape of a worm, with the head at one end and the tail at the other. The force required to power this elongation is provided by the outer layer of cells of the embryo, known as the epidermis. In these cells, motor-like proteins called myosins pull against a mesh-like scaffold within the cell called the actin cytoskeleton; this pulling is thought to squeeze the embryo all around and cause it to grow longer. Six strips of cells, running from the head to the tail, make up the epidermis of a C. elegans embryo. Myosin is mostly active in two strips of cells that run along the two sides of the embryo. In the strips above and below these strips (in other words, those on the upper and lower sides of the worm), the myosins are much less active. However, it is not fully understood how this distribution of myosin causes worms to elongate only along the head-to-tail axis. Vuong-Brender et al. have now mapped the forces exerted in the cells of the worm’s epidermis. The experiments show that, in the strips of cells on the sides of the embryo, myosin’s activity causes the epidermis to constrict around the embryo, akin to a boa constrictor tightening around its prey. At the same time, the actin filaments in the other strips form rigid bundles oriented along the circumference that stiffen the cells in these strips. This prevents the constriction from causing the embryo to inflate at the top and bottom strips. As such, the only direction the embryo can expand is along the axis that runs from its head to its tail. Together, these findings suggest that a combination of oriented force and stiffness ensure that the embryo only elongates along the head-to-tail axis. The next step is to understand how this orientation and the coordination between cells are controlled at the molecular level. DOI:http://dx.doi.org/10.7554/eLife.23866.002
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Affiliation(s)
- Thanh Thi Kim Vuong-Brender
- Laboratoire de Biologie du Développement - Institut de Biologie Paris Seine (LBD - IBPS), Sorbonne Universités, UPMC Univ Paris 06, CNRS, Paris, France.,Development and Stem Cells Program, IGBMC, CNRS (UMR7104), INSERM (U964), Université de Strasbourg, Illkirch, France
| | - Martine Ben Amar
- Laboratoire de Physique Statistique, Ecole Normale Supérieure, UPMC Université Pierre et Marie Curie, Université Paris Diderot, CNRS, Paris, France.,Institut Universitaire de Cancérologie, Faculté de Médecine, Université Pierre et Marie Curie-Paris, Paris, France
| | - Julien Pontabry
- Development and Stem Cells Program, IGBMC, CNRS (UMR7104), INSERM (U964), Université de Strasbourg, Illkirch, France
| | - Michel Labouesse
- Laboratoire de Biologie du Développement - Institut de Biologie Paris Seine (LBD - IBPS), Sorbonne Universités, UPMC Univ Paris 06, CNRS, Paris, France.,Development and Stem Cells Program, IGBMC, CNRS (UMR7104), INSERM (U964), Université de Strasbourg, Illkirch, France
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29
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Abstract
Rehabilitation and regenerative medicine therapies has shown improved outcomes for tissue regeneration. Regenerative rehabilitation guides protocols regarding when to start therapy, types of stimuli administered, and graded exercise programs, taking into account biological factors and technologies designed to optimize healing potential. Although there are currently no evidence-based guidelines for rehabilitation, fundamental physical therapy principles likely apply. Immobilization tends to have deleterious effects on musculoskeletal tissues; mechanical loading promotes tissue healing and regeneration. Common physical therapy interventions may provide beneficial effects after the application of regenerative therapies. Research is needed to determine optimal rehabilitation protocols to enhance tissue healing and regeneration.
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Affiliation(s)
- Penny L Head
- Department of Physical Therapy, University of Tennessee Health Science Center, 930 Madison Avenue, Room 604, Memphis, TN 38163, USA.
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30
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Jason Gao GJ, Holcomb MC, Thomas JH, Blawzdziewicz J. Embryo as an active granular fluid: stress-coordinated cellular constriction chains. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:414021. [PMID: 27545101 DOI: 10.1088/0953-8984/28/41/414021] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Mechanical stress plays an intricate role in gene expression in individual cells and sculpting of developing tissues. However, systematic methods of studying how mechanical stress and feedback help to harmonize cellular activities within a tissue have yet to be developed. Motivated by our observation of the cellular constriction chains (CCCs) during the initial phase of ventral furrow formation in the Drosophila melanogaster embryo, we propose an active granular fluid (AGF) model that provides valuable insights into cellular coordination in the apical constriction process. In our model, cells are treated as circular particles connected by a predefined force network, and they undergo a random constriction process in which the particle constriction probability P is a function of the stress exerted on the particle by its neighbors. We find that when P favors tensile stress, constricted particles tend to form chain-like structures. In contrast, constricted particles tend to form compact clusters when P favors compression. A remarkable similarity of constricted-particle chains and CCCs observed in vivo provides indirect evidence that tensile-stress feedback coordinates the apical constriction activity. Our particle-based AGF model will be useful in analyzing mechanical feedback effects in a wide variety of morphogenesis and organogenesis phenomena.
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Affiliation(s)
- Guo-Jie Jason Gao
- Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan
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31
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Mechanotransduction: Relevance to Physical Therapist Practice-Understanding Our Ability to Affect Genetic Expression Through Mechanical Forces. Phys Ther 2016; 96:712-21. [PMID: 26700270 DOI: 10.2522/ptj.20150073] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 12/13/2015] [Indexed: 12/20/2022]
Abstract
Mechanotransduction, the mechanism by which mechanical perturbation influences genetic expression and cellular behavior, is an area of molecular biology undergoing rapid exploration and discovery. Cells are sensitive to forces such as shear, tension, and compression, and they respond accordingly through cellular proliferation, migration, tissue repair, altered metabolism, and even stem cell differentiation and maturation. The study of how cells sense and respond to mechanical stimulation is under robust expansion, with new scientific methods and technologies at our disposal. The application of these technologies to physical therapist practice may hold answers to some of our age-old questions while creating new avenues for our profession to optimize movement for societal health. Embracing this science as foundational to our profession will allow us to be valuable scientific collaborators with distinctive knowledge of the effects of loading. These partnerships will be key to augmenting the clinical utility of emerging therapies such as regenerative medicine, tissue engineering, and gene therapy. Collaboration with other scientific disciplines in these endeavors, along with the inclusion and application of these discoveries in our academic programs, will enhance the understanding of the impact of our practice on biologic and genetic processes. A basic understanding of mechanotransduction and its relevance to physical therapist practice is warranted to begin the conversation.
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32
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Mechanical Coupling between Endoderm Invagination and Axis Extension in Drosophila. PLoS Biol 2015; 13:e1002292. [PMID: 26544693 PMCID: PMC4636290 DOI: 10.1371/journal.pbio.1002292] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 10/02/2015] [Indexed: 11/25/2022] Open
Abstract
How genetic programs generate cell-intrinsic forces to shape embryos is actively studied, but less so how tissue-scale physical forces impact morphogenesis. Here we address the role of the latter during axis extension, using Drosophila germband extension (GBE) as a model. We found previously that cells elongate in the anteroposterior (AP) axis in the extending germband, suggesting that an extrinsic tensile force contributed to body axis extension. Here we further characterized the AP cell elongation patterns during GBE, by tracking cells and quantifying their apical cell deformation over time. AP cell elongation forms a gradient culminating at the posterior of the embryo, consistent with an AP-oriented tensile force propagating from there. To identify the morphogenetic movements that could be the source of this extrinsic force, we mapped gastrulation movements temporally using light sheet microscopy to image whole Drosophila embryos. We found that both mesoderm and endoderm invaginations are synchronous with the onset of GBE. The AP cell elongation gradient remains when mesoderm invagination is blocked but is abolished in the absence of endoderm invagination. This suggested that endoderm invagination is the source of the tensile force. We next looked for evidence of this force in a simplified system without polarized cell intercalation, in acellular embryos. Using Particle Image Velocimetry, we identify posteriorwards Myosin II flows towards the presumptive posterior endoderm, which still undergoes apical constriction in acellular embryos as in wildtype. We probed this posterior region using laser ablation and showed that tension is increased in the AP orientation, compared to dorsoventral orientation or to either orientations more anteriorly in the embryo. We propose that apical constriction leading to endoderm invagination is the source of the extrinsic force contributing to germband extension. This highlights the importance of physical interactions between tissues during morphogenesis. A study of the mechanism of axis extension in developing Drosophila embryos reveals that apical constriction leading to invagination of the posterior endoderm produces a tensile force that pulls the extending germband. Embryos change shape dramatically during development. The genetic programs that drive the active behavior of cells underlying these changes are well understood, but little is known about how movements of neighboring tissues influence the shaping of a given tissue. We address this question for the anteroposterior elongation of the body axis (germband) of Drosophila embryos. We had previously shown that during elongation, the germband cells stretch along the anteroposterior axis, in addition to undergoing active rearrangements; this suggested that extrinsic tensile forces might be at play. In the current study we find that the start of main body elongation is synchronous with the invagination of both the mesoderm and the endoderm. We analyze mutants and find that cell stretching disappears in embryos lacking endoderm invagination but remains in those lacking mesoderm invagination. We then measure tension using laser ablation in acellular embryos that lack active cell rearrangements in the germband but undergo the initial stages of endoderm invagination. We find that tension is higher in the anteroposterior direction close to the invaginating endoderm. Our results indicate that endoderm invagination generates a tensile force that is transmitted to the germband, and contributes to its elongation. This study reveals how tissues interact during embryo morphogenesis.
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33
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Casares L, Vincent R, Zalvidea D, Campillo N, Navajas D, Arroyo M, Trepat X. Hydraulic fracture during epithelial stretching. NATURE MATERIALS 2015; 14:343-51. [PMID: 25664452 PMCID: PMC4374166 DOI: 10.1038/nmat4206] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Accepted: 12/23/2014] [Indexed: 05/07/2023]
Abstract
The origin of fracture in epithelial cell sheets subject to stretch is commonly attributed to excess tension in the cells' cytoskeleton, in the plasma membrane, or in cell-cell contacts. Here, we demonstrate that for a variety of synthetic and physiological hydrogel substrates the formation of epithelial cracks is caused by tissue stretching independently of epithelial tension. We show that the origin of the cracks is hydraulic; they result from a transient pressure build-up in the substrate during stretch and compression manoeuvres. After pressure equilibration, cracks heal readily through actomyosin-dependent mechanisms. The observed phenomenology is captured by the theory of poroelasticity, which predicts the size and healing dynamics of epithelial cracks as a function of the stiffness, geometry and composition of the hydrogel substrate. Our findings demonstrate that epithelial integrity is determined in a tension-independent manner by the coupling between tissue stretching and matrix hydraulics.
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Affiliation(s)
- Laura Casares
- Institute for Bioengineering of Catalonia, Barcelona, Spain
| | | | | | - Noelia Campillo
- Institute for Bioengineering of Catalonia, Barcelona, Spain
- Unitat de Biofísica i Bioenginyeria, Facultat de Medicina, Universitat de Barcelona, and CIBERES, Spain
| | - Daniel Navajas
- Institute for Bioengineering of Catalonia, Barcelona, Spain
- Unitat de Biofísica i Bioenginyeria, Facultat de Medicina, Universitat de Barcelona, and CIBERES, Spain
| | - Marino Arroyo
- Universitat Politècnica de Catalunya-BarcelonaTech, Spain
- Corresponding authors: Marino Arroyo, Universitat Politècnica de Catalunya, Carrer Jordi Girona 1, 08034, Barcelona, Spain, (+34) 934 011 805, ; Xavier Trepat, Institute for Bioengineering of Catalonia, Ed. Hèlix, Baldiri i Reixac, 15-21, 08028, Barcelona, Spain, (+34) 934 020 265,
| | - Xavier Trepat
- Institute for Bioengineering of Catalonia, Barcelona, Spain
- Unitat de Biofísica i Bioenginyeria, Facultat de Medicina, Universitat de Barcelona, and CIBERES, Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
- Corresponding authors: Marino Arroyo, Universitat Politècnica de Catalunya, Carrer Jordi Girona 1, 08034, Barcelona, Spain, (+34) 934 011 805, ; Xavier Trepat, Institute for Bioengineering of Catalonia, Ed. Hèlix, Baldiri i Reixac, 15-21, 08028, Barcelona, Spain, (+34) 934 020 265,
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34
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Dent JE, Devescovi V, Li H, Di Lena P, Lu Y, Liu Y, Nardini C. Mechanotransduction map: simulation model, molecular pathway, gene set. ACTA ACUST UNITED AC 2014; 31:1053-9. [PMID: 25429059 DOI: 10.1093/bioinformatics/btu776] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Accepted: 11/17/2014] [Indexed: 01/07/2023]
Abstract
MOTIVATION Mechanotransduction--the ability to output a biochemical signal from a mechanical input--is related to the initiation and progression of a broad spectrum of molecular events. Yet, the characterization of mechanotransduction lacks some of the most basic tools as, for instance, it can hardly be recognized by enrichment analysis tools, nor could we find any pathway representation. This greatly limits computational testing and hypothesis generation on mechanotransduction biological relevance and involvement in disease or physiological mechanisms. RESULTS We here present a molecular map of mechanotransduction, built in CellDesigner to warrant that maximum information is embedded in a compact network format. To validate the map's necessity we tested its redundancy in comparison with existing pathways, and to estimate its sufficiency, we quantified its ability to reproduce biological events with dynamic simulations, using Signaling Petri Networks. AVAILABILITY AND IMPLEMENTATION SMBL language map is available in the Supplementary Data: core_map.xml, basic_map.xml. SUPPLEMENTARY INFORMATION Supplementary data are available at Bioinformatics online.
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Affiliation(s)
- Jennifer E Dent
- Group of Clinical Genomic Networks, Key Laboratory of Computational Biology, CAS-MPG Partner Institute for Computational Biology, Shanghai Institutes for Biological Sciences, Shanghai, People's Republic of China, Quintiles, Global Biostatistics, Reading, Berkshire, UK and Department of Computer Science and Engineering - DISI, University of Bologna, Bologna, Italy Group of Clinical Genomic Networks, Key Laboratory of Computational Biology, CAS-MPG Partner Institute for Computational Biology, Shanghai Institutes for Biological Sciences, Shanghai, People's Republic of China, Quintiles, Global Biostatistics, Reading, Berkshire, UK and Department of Computer Science and Engineering - DISI, University of Bologna, Bologna, Italy
| | - Valentina Devescovi
- Group of Clinical Genomic Networks, Key Laboratory of Computational Biology, CAS-MPG Partner Institute for Computational Biology, Shanghai Institutes for Biological Sciences, Shanghai, People's Republic of China, Quintiles, Global Biostatistics, Reading, Berkshire, UK and Department of Computer Science and Engineering - DISI, University of Bologna, Bologna, Italy
| | - Han Li
- Group of Clinical Genomic Networks, Key Laboratory of Computational Biology, CAS-MPG Partner Institute for Computational Biology, Shanghai Institutes for Biological Sciences, Shanghai, People's Republic of China, Quintiles, Global Biostatistics, Reading, Berkshire, UK and Department of Computer Science and Engineering - DISI, University of Bologna, Bologna, Italy
| | - Pietro Di Lena
- Group of Clinical Genomic Networks, Key Laboratory of Computational Biology, CAS-MPG Partner Institute for Computational Biology, Shanghai Institutes for Biological Sciences, Shanghai, People's Republic of China, Quintiles, Global Biostatistics, Reading, Berkshire, UK and Department of Computer Science and Engineering - DISI, University of Bologna, Bologna, Italy
| | - Youtao Lu
- Group of Clinical Genomic Networks, Key Laboratory of Computational Biology, CAS-MPG Partner Institute for Computational Biology, Shanghai Institutes for Biological Sciences, Shanghai, People's Republic of China, Quintiles, Global Biostatistics, Reading, Berkshire, UK and Department of Computer Science and Engineering - DISI, University of Bologna, Bologna, Italy
| | - Yuanhua Liu
- Group of Clinical Genomic Networks, Key Laboratory of Computational Biology, CAS-MPG Partner Institute for Computational Biology, Shanghai Institutes for Biological Sciences, Shanghai, People's Republic of China, Quintiles, Global Biostatistics, Reading, Berkshire, UK and Department of Computer Science and Engineering - DISI, University of Bologna, Bologna, Italy
| | - Christine Nardini
- Group of Clinical Genomic Networks, Key Laboratory of Computational Biology, CAS-MPG Partner Institute for Computational Biology, Shanghai Institutes for Biological Sciences, Shanghai, People's Republic of China, Quintiles, Global Biostatistics, Reading, Berkshire, UK and Department of Computer Science and Engineering - DISI, University of Bologna, Bologna, Italy
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35
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Osmani N, Labouesse M. Remodeling of keratin-coupled cell adhesion complexes. Curr Opin Cell Biol 2014; 32:30-8. [PMID: 25460779 DOI: 10.1016/j.ceb.2014.10.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 10/13/2014] [Accepted: 10/18/2014] [Indexed: 12/12/2022]
Abstract
Epithelial cells constitute the main barrier between the inside and outside of organs, acting as gatekeepers of their structure and integrity. Hemidesmosomes and desmosomes are respectively cell-matrix and cell-cell adhesions coupled to the intermediate filament cytoskeleton. These adhesions ensure mechanical integrity of the epithelial barrier. Although desmosomes and hemidesmosomes are essential in maintaining strong cell-cell and cell-matrix adhesions, there is an emerging view that they should be remodeled in order to maintain epithelial homeostasis. Here we review the adhesion properties of desmosomes and hemidesmosomes, as well as the mechanisms driving their remodeling. We also discuss recent data suggesting that keratin-coupled adhesion complexes can sense the biomechanical cellular environment and participate in the cellular response to such external cues.
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Affiliation(s)
- Naël Osmani
- IGBMC, Development and Stem Cells Program, 67400 Illkirch, France; CNRS (UMR 7104), 67400 Illkirch, France; INSERM (U964), 67400 Illkirch, France; Université de Strasbourg, 67400 Illkirch, France.
| | - Michel Labouesse
- IGBMC, Development and Stem Cells Program, 67400 Illkirch, France; CNRS (UMR 7104), 67400 Illkirch, France; INSERM (U964), 67400 Illkirch, France; Université de Strasbourg, 67400 Illkirch, France.
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Yan J, Yao M, Goult BT, Sheetz MP. Talin Dependent Mechanosensitivity of Cell Focal Adhesions. Cell Mol Bioeng 2014; 8:151-159. [PMID: 26097520 PMCID: PMC4468797 DOI: 10.1007/s12195-014-0364-5] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Accepted: 10/25/2014] [Indexed: 12/11/2022] Open
Abstract
A fundamental question in mechanobiology is how mechanical stimuli are sensed by mechanosensing proteins and converted into signals that direct cells to adapt to the external environment. A key function of cell adhesion to the extracellular matrix (ECM) is to transduce mechanical forces between cells and their extracellular environment. Talin, a cytoplasmic adapter essential for integrin-mediated adhesion to the ECM, links the actin cytoskeleton to integrin at the plasma membrane. Here, we review recent progress in the understanding of talin-dependent mechanosensing revealed by stretching single talin molecules. Rapid progress in single-molecule force manipulation technologies has made it possible to directly study the impact of mechanical force on talin's conformations and its interactions with other signaling proteins. We also provide our views on how findings from such studies may bring new insights into understanding the principles of mechanobiology on a broader scale, and how such fundamental knowledge may be harnessed for mechanopharmacology.
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Affiliation(s)
- Jie Yan
- Mechanobiology Institute, National University of Singapore, Singapore, 117411 Singapore ; Department of Physics, National University of Singapore, Singapore, 117542 Singapore ; Centre for Bioimaging Sciences, National University of Singapore, Singapore, 117546 Singapore
| | - Mingxi Yao
- Mechanobiology Institute, National University of Singapore, Singapore, 117411 Singapore
| | - Benjamin T Goult
- School of Biosciences, University of Kent, Canterbury, CT2 7NJ Kent UK
| | - Michael P Sheetz
- Mechanobiology Institute, National University of Singapore, Singapore, 117411 Singapore ; Department of Biological Sciences, Columbia University, New York, NY 10027 USA
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Yao M, Qiu W, Liu R, Efremov AK, Cong P, Seddiki R, Payre M, Lim CT, Ladoux B, Mège RM, Yan J. Force-dependent conformational switch of α-catenin controls vinculin binding. Nat Commun 2014; 5:4525. [PMID: 25077739 DOI: 10.1038/ncomms5525] [Citation(s) in RCA: 306] [Impact Index Per Article: 30.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Accepted: 06/25/2014] [Indexed: 02/08/2023] Open
Abstract
Force sensing at cadherin-mediated adhesions is critical for their proper function. α-Catenin, which links cadherins to actomyosin, has a crucial role in this mechanosensing process. It has been hypothesized that force promotes vinculin binding, although this has never been demonstrated. X-ray structure further suggests that α-catenin adopts a stable auto-inhibitory conformation that makes the vinculin-binding site inaccessible. Here, by stretching single α-catenin molecules using magnetic tweezers, we show that the subdomains MI vinculin-binding domain (VBD) to MIII unfold in three characteristic steps: a reversible step at ~5 pN and two non-equilibrium steps at 10-15 pN. 5 pN unfolding forces trigger vinculin binding to the MI domain in a 1:1 ratio with nanomolar affinity, preventing MI domain refolding after force is released. Our findings demonstrate that physiologically relevant forces reversibly unfurl α-catenin, activating vinculin binding, which then stabilizes α-catenin in its open conformation, transforming force into a sustainable biochemical signal.
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Affiliation(s)
- Mingxi Yao
- 1] Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore [2]
| | - Wu Qiu
- 1] Department of Physics, National University of Singapore, Singapore 117542, Singapore [2] College of Physics, Chongqing University, No. 55 Daxuecheng South Road, Chongqing 401331, China [3]
| | - Ruchuan Liu
- 1] Department of Physics, National University of Singapore, Singapore 117542, Singapore [2] College of Physics, Chongqing University, No. 55 Daxuecheng South Road, Chongqing 401331, China
| | - Artem K Efremov
- Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore
| | - Peiwen Cong
- 1] Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore [2] Singapore-MIT Alliance for Research and Technology, National University of Singapore, Singapore 117543, Singapore
| | - Rima Seddiki
- Institut Jacques Monod, CNRS UMR 7592, Université Paris Diderot, Paris 75013, France
| | - Manon Payre
- Institut Jacques Monod, CNRS UMR 7592, Université Paris Diderot, Paris 75013, France
| | - Chwee Teck Lim
- 1] Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore [2] Department of Bioengineering, National University of Singapore, Singapore 117542, Singapore
| | - Benoit Ladoux
- 1] Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore [2] Institut Jacques Monod, CNRS UMR 7592, Université Paris Diderot, Paris 75013, France
| | - René-Marc Mège
- Institut Jacques Monod, CNRS UMR 7592, Université Paris Diderot, Paris 75013, France
| | - Jie Yan
- 1] Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore [2] College of Physics, Chongqing University, No. 55 Daxuecheng South Road, Chongqing 401331, China [3] Department of Bioengineering, National University of Singapore, Singapore 117542, Singapore [4] Centre for Bioimaging Sciences, National University of Singapore, Singapore 117546, Singapore
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Fischer SC, Blanchard GB, Duque J, Adams RJ, Arias AM, Guest SD, Gorfinkiel N. Contractile and mechanical properties of epithelia with perturbed actomyosin dynamics. PLoS One 2014; 9:e95695. [PMID: 24759936 PMCID: PMC3997421 DOI: 10.1371/journal.pone.0095695] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Accepted: 03/31/2014] [Indexed: 11/18/2022] Open
Abstract
Mechanics has an important role during morphogenesis, both in the generation of forces driving cell shape changes and in determining the effective material properties of cells and tissues. Drosophila dorsal closure has emerged as a reference model system for investigating the interplay between tissue mechanics and cellular activity. During dorsal closure, the amnioserosa generates one of the major forces that drive closure through the apical contraction of its constituent cells. We combined quantitation of live data, genetic and mechanical perturbation and cell biology, to investigate how mechanical properties and contraction rate emerge from cytoskeletal activity. We found that a decrease in Myosin phosphorylation induces a fluidization of amnioserosa cells which become more compliant. Conversely, an increase in Myosin phosphorylation and an increase in actin linear polymerization induce a solidification of cells. Contrary to expectation, these two perturbations have an opposite effect on the strain rate of cells during DC. While an increase in actin polymerization increases the contraction rate of amnioserosa cells, an increase in Myosin phosphorylation gives rise to cells that contract very slowly. The quantification of how the perturbation induced by laser ablation decays throughout the tissue revealed that the tissue in these two mutant backgrounds reacts very differently. We suggest that the differences in the strain rate of cells in situations where Myosin activity or actin polymerization is increased arise from changes in how the contractile forces are transmitted and coordinated across the tissue through ECadherin-mediated adhesion. Altogether, our results show that there is an optimal level of Myosin activity to generate efficient contraction and suggest that the architecture of the actin cytoskeleton and the dynamics of adhesion complexes are important parameters for the emergence of coordinated activity throughout the tissue.
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Affiliation(s)
- Sabine C. Fischer
- Buchmann Institute for Molecular Life Sciences, Department of Biological Sciences, Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Guy B. Blanchard
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, United Kingdom
| | - Julia Duque
- Centro de Biología Molecular “Severo Ochoa”, CSIC-UAM, Cantoblanco, Madrid, Spain
| | - Richard J. Adams
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, United Kingdom
| | - Alfonso Martinez Arias
- Buchmann Institute for Molecular Life Sciences, Department of Biological Sciences, Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Simon D. Guest
- Department of Engineering, University of Cambridge, Cambridge, United Kingdom
| | - Nicole Gorfinkiel
- Centro de Biología Molecular “Severo Ochoa”, CSIC-UAM, Cantoblanco, Madrid, Spain
- * E-mail:
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The PAF1 complex is involved in embryonic epidermal morphogenesis in Caenorhabditis elegans. Dev Biol 2014; 391:43-53. [PMID: 24721716 DOI: 10.1016/j.ydbio.2014.04.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Revised: 03/29/2014] [Accepted: 04/02/2014] [Indexed: 11/21/2022]
Abstract
The PAF1 complex (PAF1C) is an evolutionarily conserved protein complex involved in transcriptional regulation and chromatin remodeling. How the PAF1C is involved in animal development is still not well understood. Here, we report that, in the nematode Caenorhabditis elegans, the PAF1C is involved in epidermal morphogenesis in late embryogenesis. From an RNAi screen we identified the C. elegans ortholog of a component of the PAF1C, CTR-9, as a gene whose depletion caused various defects during embryonic epidermal morphogenesis, including epidermal cell positioning, ventral enclosure and epidermal elongation. RNAi of orthologs of other four components of the PAF1C (PAFO-1, LEO-1, CDC-73 and RTFO-1) caused similar epidermal defects. In these embryos, whereas the number and cell fate determination of epidermal cells were apparently unaffected, their position and shape were severely disorganized. PAFO-1::mCherry, mCherry::LEO-1 and GFP::RTFO-1 driven by the authentic promoters were detected in the nuclei of a wide range of cells. Nuclear localization of GFP::RTFO-1 was independent of other PAF1C components, while PAFO-1::mCherry and mCherry::LEO-1 dependent on other components except RTFO-1. Epidermis-specific expression of mCherry::LEO-1 rescued embryonic lethality of the leo-1 deletion mutant. Thus, although the PAF1C is universally expressed in C. elegans embryos, its epidermal function is crucial for the viability of this animal.
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Wernike D, van Oostende C, Piekny A. Visualizing neuroblast cytokinesis during C. elegans embryogenesis. J Vis Exp 2014. [PMID: 24686748 DOI: 10.3791/51188] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
This protocol describes the use of fluorescence microscopy to image dividing cells within developing Caenorhabditis elegans embryos. In particular, this protocol focuses on how to image dividing neuroblasts, which are found underneath the epidermal cells and may be important for epidermal morphogenesis. Tissue formation is crucial for metazoan development and relies on external cues from neighboring tissues. C. elegans is an excellent model organism to study tissue morphogenesis in vivo due to its transparency and simple organization, making its tissues easy to study via microscopy. Ventral enclosure is the process where the ventral surface of the embryo is covered by a single layer of epithelial cells. This event is thought to be facilitated by the underlying neuroblasts, which provide chemical guidance cues to mediate migration of the overlying epithelial cells. However, the neuroblasts are highly proliferative and also may act as a mechanical substrate for the ventral epidermal cells. Studies using this experimental protocol could uncover the importance of intercellular communication during tissue formation, and could be used to reveal the roles of genes involved in cell division within developing tissues.
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Kopf J, Paarmann P, Hiepen C, Horbelt D, Knaus P. BMP growth factor signaling in a biomechanical context. Biofactors 2014; 40:171-87. [PMID: 24123658 DOI: 10.1002/biof.1137] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2013] [Revised: 07/07/2013] [Accepted: 08/01/2013] [Indexed: 01/10/2023]
Abstract
Bone Morphogenetic Proteins (BMPs) are members of the transforming growth factor-β superfamily of secreted polypeptide growth factors and are important regulators in a multitude of cellular processes. To ensure the precise and balanced propagation of their pleiotropic signaling responses, BMPs and their corresponding signaling pathways are subject to tight control. A large variety of regulatory mechanisms throughout different biological levels combines into a complex network and provides the basis for physiological BMP function. This regulatory network not only includes biochemical factors but also mechanical cues. Both BMP signaling and mechanotransduction pathways are tightly interconnected and represent an elaborate signaling network active during development but also during organ homeostasis. Moreover, its dysregulation is associated with a number of human pathologies. A more detailed understanding of this crosstalk in respect to molecular interactions will be indispensable in the future, in particular to understand BMP-related diseases as well as with regard to an efficient clinical application of BMP ligands.
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Affiliation(s)
- Jessica Kopf
- Institute for Chemistry/Biochemistry, Freie Universität, Berlin, Berlin, Germany
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Chatterjee S, Fisher AB. Mechanotransduction in the endothelium: role of membrane proteins and reactive oxygen species in sensing, transduction, and transmission of the signal with altered blood flow. Antioxid Redox Signal 2014; 20:899-913. [PMID: 24328670 PMCID: PMC3924805 DOI: 10.1089/ars.2013.5624] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
SIGNIFICANCE Changes in shear stress associated with alterations in blood flow initiate a signaling cascade that modulates the vascular phenotype. Shear stress is "sensed" by the endothelium via a mechanosensitive complex on the endothelial cell (EC) membrane that has been characterized as a "mechanosome" consisting of caveolae, platelet endothelial cell adhesion molecule (PECAM), vascular endothelial growth factor receptor 2 (VEGFR2), vascular endothelial (VE)-cadherin, and possibly other elements. This shear signal is transduced by cell membrane ion channels and various kinases and results in the activation of NADPH oxidase (type 2) with the production of reactive oxygen species (ROS). RECENT ADVANCES The signaling cascade associated with stop of shear, as would occur in vivo with various obstructive pathologies, leads to cell proliferation and eventual revascularization. CRITICAL ISSUES AND FUTURE DIRECTIONS Although several elements of mechanosensing such as the sensing event, the transduction, transmission, and reception of the mechanosignal are now reasonably well understood, the links among these discrete steps in the pathway are not clear. Thus, identifying the mechanisms for the interaction of the K(ATP) channel, the kinases, and ROS to drive long-term adaptive responses in ECs is necessary. A critical re-examination of the signaling events associated with complex flow patterns (turbulent, oscillatory) under physiological conditions is also essential for the progress in the field. Since these complex shear patterns may be associated with an atherosclerosis susceptible phenotype, a specific challenge will be the pharmacological modulation of the responses to altered signaling events that occur at specific sites of disturbed or obstructed flow.
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Affiliation(s)
- Shampa Chatterjee
- Institute for Environmental Medicine, Perelman School of Medicine, University of Pennsylvania , Philadelphia, Pennsylvania
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Toll mediated infection response is altered by gravity and spaceflight in Drosophila. PLoS One 2014; 9:e86485. [PMID: 24475130 PMCID: PMC3901686 DOI: 10.1371/journal.pone.0086485] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Accepted: 12/12/2013] [Indexed: 11/19/2022] Open
Abstract
Space travel presents unlimited opportunities for exploration and discovery, but requires better understanding of the biological consequences of long-term exposure to spaceflight. Immune function in particular is relevant for space travel. Human immune responses are weakened in space, with increased vulnerability to opportunistic infections and immune-related conditions. In addition, microorganisms can become more virulent in space, causing further challenges to health. To understand these issues better and to contribute to design of effective countermeasures, we used the Drosophila model of innate immunity to study immune responses in both hypergravity and spaceflight. Focusing on infections mediated through the conserved Toll and Imd signaling pathways, we found that hypergravity improves resistance to Toll-mediated fungal infections except in a known gravitaxis mutant of the yuri gagarin gene. These results led to the first spaceflight project on Drosophila immunity, in which flies that developed to adulthood in microgravity were assessed for immune responses by transcription profiling on return to Earth. Spaceflight alone altered transcription, producing activation of the heat shock stress system. Space flies subsequently infected by fungus failed to activate the Toll pathway. In contrast, bacterial infection produced normal activation of the Imd pathway. We speculate on possible linkage between functional Toll signaling and the heat shock chaperone system. Our major findings are that hypergravity and spaceflight have opposing effects, and that spaceflight produces stress-related transcriptional responses and results in a specific inability to mount a Toll-mediated infection response.
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Greiner AM, Jäckel M, Scheiwe AC, Stamow DR, Autenrieth TJ, Lahann J, Franz CM, Bastmeyer M. Multifunctional polymer scaffolds with adjustable pore size and chemoattractant gradients for studying cell matrix invasion. Biomaterials 2014; 35:611-9. [DOI: 10.1016/j.biomaterials.2013.09.095] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Accepted: 09/24/2013] [Indexed: 12/29/2022]
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Cram EJ. Mechanotransduction in C. elegans morphogenesis and tissue function. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2014; 126:281-316. [PMID: 25081623 DOI: 10.1016/b978-0-12-394624-9.00012-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Mechanobiology is an emerging field that investigates how living cells sense and respond to their physical surroundings. Recent interest in the field has been sparked by the finding that stem cells differentiate along different lineages based on the stiffness of the cell surroundings (Engler et al., 2006), and that metastatic behavior of cancer cells is strongly influenced by the mechanical properties of the surrounding tissue (Kumar and Weaver, 2009). Many questions remain about how cells convert mechanical information, such as viscosity, stiffness of the substrate, or stretch state of the cells, into the biochemical signals that control tissue function. Caenorhabditis elegans researchers are making significant contributions to the understanding of mechanotransduction in vivo. This review summarizes recent insights into the role of mechanical forces in morphogenesis and tissue function. Examples of mechanical regulation across length scales, from the single-celled zygote, to the intercellular coordination that enables cohesive tissue function, to the mechanical influences between tissues, are considered. The power of the C. elegans system as a gene discovery and in vivo quantitative bioimaging platform is enabling an important discoveries in this exciting field.
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Affiliation(s)
- Erin J Cram
- Department of Biology, Northeastern University, Boston, Massachusetts, USA
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46
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Caenorhabditis elegans anillin (ani-1) regulates neuroblast cytokinesis and epidermal morphogenesis during embryonic development. Dev Biol 2013; 383:61-74. [DOI: 10.1016/j.ydbio.2013.08.024] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2013] [Revised: 08/24/2013] [Accepted: 08/27/2013] [Indexed: 11/23/2022]
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Abstract
The development of the nervous system has so far, to a large extent, been considered in the context of biochemistry, molecular biology and genetics. However, there is growing evidence that many biological systems also integrate mechanical information when making decisions during differentiation, growth, proliferation, migration and general function. Based on recent findings, I hypothesize that several steps during nervous system development, including neural progenitor cell differentiation, neuronal migration, axon extension and the folding of the brain, rely on or are even driven by mechanical cues and forces.
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Affiliation(s)
- Kristian Franze
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3DY, UK.
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Hara Y, Nagayama K, Yamamoto TS, Matsumoto T, Suzuki M, Ueno N. Directional migration of leading-edge mesoderm generates physical forces: Implication in Xenopus notochord formation during gastrulation. Dev Biol 2013; 382:482-95. [PMID: 23933171 DOI: 10.1016/j.ydbio.2013.07.023] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Revised: 07/15/2013] [Accepted: 07/27/2013] [Indexed: 12/17/2022]
Abstract
Gastrulation is a dynamic tissue-remodeling process occurring during early development and fundamental to the later organogenesis. It involves both chemical signals and physical factors. Although much is known about the molecular pathways involved, the roles of physical forces in regulating cellular behavior and tissue remodeling during gastrulation have just begun to be explored. Here, we characterized the force generated by the leading edge mesoderm (LEM) that migrates preceding axial mesoderm (AM), and investigated the contribution of LEM during Xenopus gastrulation. First, we constructed an assay system using micro-needle which could measure physical forces generated by the anterior migration of LEM, and estimated the absolute magnitude of the force to be 20-80nN. Second, laser ablation experiments showed that LEM could affect the force distribution in the AM (i.e. LEM adds stretch force on axial mesoderm along anterior-posterior axis). Third, migrating LEM was found to be necessary for the proper gastrulation cell movements and the establishment of organized notochord structure; a reduction of LEM migratory activity resulted in the disruption of mediolateral cell orientation and convergence in AM. Finally, we found that LEM migration cooperates with Wnt/PCP to form proper notochord. These results suggest that the force generated by the directional migration of LEM is transmitted to AM and assists the tissue organization of notochord in vivo independently of the regulation by Wnt/PCP. We propose that the LEM may have a mechanical role in aiding the AM elongation through the rearrangement of force distribution in the dorsal marginal zone.
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Affiliation(s)
- Yusuke Hara
- Division for Morphogenesis, Department of Developmental Biology, National Institute for Basic Biology, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan; Department of Basic Biology, School of Life Science, The Graduate University of Advanced Studies (SOKENDAI), 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan
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Regulation of tissue fibrosis by the biomechanical environment. BIOMED RESEARCH INTERNATIONAL 2013; 2013:101979. [PMID: 23781495 PMCID: PMC3679815 DOI: 10.1155/2013/101979] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Accepted: 05/10/2013] [Indexed: 12/21/2022]
Abstract
The biomechanical environment plays a fundamental role in embryonic development, tissue maintenance, and pathogenesis. Mechanical forces play particularly important roles in the regulation of connective tissues including not only bone and cartilage but also the interstitial tissues of most organs. In vivo studies have correlated changes in mechanical load to modulation of the extracellular matrix and have indicated that increased mechanical force contributes to the enhanced expression and deposition of extracellular matrix components or fibrosis. Pathological fibrosis contributes to dysfunction of many organ systems. A variety of in vitro models have been utilized to evaluate the effects of mechanical force on extracellular matrix-producing cells. In general, application of mechanical stretch, fluid flow, and compression results in increased expression of extracellular matrix components. More recent studies have indicated that tissue rigidity also provides profibrotic signals to cells. The mechanisms whereby cells detect mechanical signals and transduce them into biochemical responses have received considerable attention. Cell surface receptors for extracellular matrix components and intracellular signaling pathways are instrumental in the mechanotransduction process. Understanding how mechanical signals are transmitted from the microenvironment will identify novel therapeutic targets for fibrosis and other pathological conditions.
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50
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Abstract
Biological cells are well known to respond to a multitude of chemical signals. In the nervous system, chemical signaling has been shown to be crucially involved in development, normal functioning, and disorders of neurons and glial cells. However, there are an increasing number of studies showing that these cells also respond to mechanical cues. Here, we summarize current knowledge about the mechanical properties of nervous tissue and its building blocks, review recent progress in methodology and understanding of cellular mechanosensitivity in the nervous system, and provide an outlook on the implications of neuromechanics for future developments in biomedical engineering to aid overcoming some of the most devastating and currently incurable CNS pathologies such as spinal cord injuries and multiple sclerosis.
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Affiliation(s)
- Kristian Franze
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3DY, UK.
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